Changed C1Pjs to display 25 rows instead of 24
This commit is contained in:
Jeff Parsons
jeffpar
parent
ae12b3293b
commit
9ba73970a4
15 changed files with 64 additions and 43 deletions
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@ -82,7 +82,7 @@ The "S40344" indicates that it's a B1 stepping, although I'm not currently able
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According to [OS/2 Museum](http://os2museum.com) proprietor Michal Necasek, the "L8260347" means:
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[I]t was actually manufactured in mid-1988. It took me many years to realize how Intel marked the chips.
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[I]t was actually manufactured in mid-1988. It took me many years to realize how Intel marked the chips.
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The initial 'L' (or whatever number/letter it is) can be ignored and the following 3 digits (826) are the
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date code. The first is the last digit of the year.... The last two digits are the week of manufacture,
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so week 26 of 1988. Many Intel CPUs actually have 2 or 3 date codes on them, probably related to when the
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@ -90,10 +90,10 @@ According to [OS/2 Museum](http://os2museum.com) proprietor Michal Necasek, the
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there might be another date code on the bottom side, but if there is, it's not going to be too far apart
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from the one on the top and it's going to be slightly older.
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One good thing about my 80386-B1 CPU is that it's also marked with a "ΣΣ" (double sigma),
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which is how Intel marked parts that tested safe for 32-bit multiplication. Some 80386 CPUs suffered
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from a manufacturing defect that could occasionally result in multiplication errors; those that Intel
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caught were marked with "16 BIT S/W ONLY" instead of the double sigma.
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Fortunately, my 80386-B1 CPU is also marked with a "ΣΣ" (double sigma), which is how Intel marked
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parts that tested safe for 32-bit multiplication. Some 80386 CPUs suffered from a manufacturing defect that
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could occasionally result in multiplication errors; defective parts that Intel caught were marked with "16 BIT S/W ONLY"
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instead of the double sigma.
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The only other information I have about revision levels comes from a March 30, 1987 document titled
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"**80386-C0 STEPPING INFORMATION**":
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@ -19,7 +19,7 @@
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<rom id="romNull" size="0x2000"/>
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<rom id="romBasic" size="0x2000" image="/devices/c1p/rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="/devices/c1p/rom/system.hex"/>
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<video id="video" screenwidth="512" screenheight="384" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" width="512px" padding="8px">
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<video id="video" screenwidth="512" screenheight="400" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" width="512px" padding="8px">
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<name>Video Display</name>
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</video>
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<keyboard id="keyboard" padleft="8px">
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@ -18,7 +18,7 @@
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<rom id="romNull" size="0x8000"/>
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<rom id="romBasic" size="0x2000" image="/devices/c1p/rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="/devices/c1p/rom/system.hex"/>
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<video id="video" screenwidth="512" screenheight="384" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" width="512px" padding="8px">
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<video id="video" screenwidth="512" screenheight="400" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" width="512px" padding="8px">
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<name>Video Display</name>
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</video>
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<keyboard id="keyboard" padleft="8px">
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@ -15,7 +15,7 @@
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<rom id="romNull" size="0x8000"/>
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<rom id="romBasic" size="0x2000" image="/devices/c1p/rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="/devices/c1p/rom/system.hex"/>
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<video id="video" screenwidth="256" screenheight="192" cols="32" rows="32" charset="/devices/c1p/video/chargen1x.png" width="256px" padding="8px"/>
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<video id="video" screenwidth="256" screenheight="200" cols="32" rows="32" charset="/devices/c1p/video/chargen1x.png" width="256px" padding="8px"/>
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<keyboard id="keyboard" pos="center">
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<control type="button" binding="ctrl-c">CTRL-C</control>
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<control type="button" binding="ctrl-o">CTRL-O</control>
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@ -18,7 +18,7 @@
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<rom id="romNull" size="0x8000"/>
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<rom id="romBasic" size="0x2000" image="../../../../rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="../../../../rom/system.hex"/>
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<video id="video" screenwidth="512" screenheight="384" cols="32" rows="32" charset="../../../../video/chargen2x.png" width="512px" padding="8px">
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<video id="video" screenwidth="512" screenheight="400" cols="32" rows="32" charset="../../../../video/chargen2x.png" width="512px" padding="8px">
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<name>Video Display</name>
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</video>
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<keyboard id="keyboard" padleft="8px">
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@ -18,7 +18,7 @@
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<rom id="romNull" size="0x8000"/>
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<rom id="romBasic" size="0x2000" image="/devices/c1p/rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="/devices/c1p/rom/system.hex"/>
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<video id="video" screenwidth="512" screenheight="384" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" width="512px" padding="8px">
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<video id="video" screenwidth="512" screenheight="400" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" width="512px" padding="8px">
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<name>Video Display</name>
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</video>
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<keyboard id="keyboard" padleft="8px">
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@ -16,7 +16,7 @@
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<rom id="romNull" size="0x8000"/>
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<rom id="romBasic" size="0x2000" image="/devices/c1p/rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="/devices/c1p/rom/system.hex"/>
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<video id="video" screenwidth="512" screenheight="384" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" padding="8px"/>
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<video id="video" screenwidth="512" screenheight="400" cols="32" rows="32" charset="/devices/c1p/video/chargen2x.png" padding="8px"/>
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<cpu id="cpu6502" autostart="false" pos="left" padleft="8px">
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<control type="button" binding="run">Run</control>
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</cpu>
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@ -16,7 +16,7 @@
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<rom id="romNull" size="0x8000"/>
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<rom id="romBasic" size="0x2000" image="/devices/c1p/rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="/devices/c1p/rom/system.hex"/>
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<video id="video" screenwidth="256" screenheight="192" cols="32" rows="32" charset="/devices/c1p/video/chargen1x.png" width="256px" padding="8px"/>
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<video id="video" screenwidth="256" screenheight="200" cols="32" rows="32" charset="/devices/c1p/video/chargen1x.png" width="256px" padding="8px"/>
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<keyboard id="keyboard" padleft="8px">
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<control type="button" binding="ctrl-c">CTRL-C</control>
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<control type="button" binding="ctrl-o">CTRL-O</control>
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@ -20,7 +20,7 @@
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<rom id="romNull" size="0x8000"/>
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<rom id="romBasic" size="0x2000" image="/devices/c1p/rom/basic-gcpatch.hex"/>
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<rom id="romSystem" size="0x0800" image="/devices/c1p/rom/system.hex"/>
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<video id="video" screenwidth="256" screenheight="192" cols="32" rows="32" charset="/devices/c1p/video/chargen1x.png" padding="8px"/>
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<video id="video" screenwidth="256" screenheight="200" cols="32" rows="32" charset="/devices/c1p/video/chargen1x.png" padding="8px"/>
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<keyboard id="keyboard">
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<control type="button" binding="ctrl-c">CTRL-C</control>
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<control type="button" binding="break">BREAK</control>
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@ -67,17 +67,21 @@
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* to the lack of a "guard band feature." Similarly, BASIC defaults to a width of 24 columns
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* avoid display problems near the right edge. BASIC will let you choose a width SMALLER than
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* 24 but not larger. So, while the video buffer supports a theoretical maximum of 32 rows x 32
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* columns, the practical maximum is 24 rows x 24 columns; the last 4 rows of the video buffer
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* are never used, and while content scrolls through the top 4 lines of the buffer, it is never
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* assumed that you can see the top 4 lines.
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* columns, the practical maximum is 25 rows x 24 columns; the last 4 rows of the video buffer
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* are never used, and while content DOES scroll through the top 4 lines of the buffer, it should
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* never be assumed that you can see the top 3 lines.
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*
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* This is partially confirmed by the "C1P Character Graphics Reference Manual", p3, which says
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* that the "the visible character field consists of 25 lines of 25 columns" and that the "first
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* visible character in the upper left of the screen is accessed via address 53379," or 0xD083,
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* confirming that the first 4 lines are not assumed to be visible. However, the comment
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* regarding "25 lines of 25 columns" seems to be off by one in both dimensions. And why would
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* they say that the first visible address is 0xD083 instead of 0xD085? An indentation of 5 bytes,
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* rather than 3, would be more consistent with how the C1P ROMs use video memory.
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* visible character in the upper left of the screen is accessed via address 53379," or 0xD083.
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*
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* They actually meant 0xD085, because as mentioned earlier, the C1P indents every row by 5
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* characters, not 3. Even so, the difference between 0xD365 (where the bottom line starts)
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* and 0xD085 is 0x2E0, or 736. And 736 divided by 32 gives 23; add the bottom row, and that
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* gives you 24 visible rows, not 25. Since we now have screenshots of a C1P monitor displaying
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* 25 rows (courtesy of Stephan Mühlstrasser <stephan.muehlstrasser@web.de>), C1Pjs now assumes
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* 25 rows, which means that only the first 3 lines are not visible, which necessarily puts
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* the address of the first visible character at 0xD065.
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*
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* Model 540 Video Board vs. Model 600 "Superboard II"
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* ---------------------------------------------------
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@ -274,7 +278,7 @@ C1PVideo.prototype.setModel = function(nModel)
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* the only other supported model is 540 (2K video buffer).
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*/
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if (this.nModel == 600) {
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this.setDimensions(this.nDefaultCols, this.nDefaultRows, 4, 24);
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this.setDimensions(this.nDefaultCols, this.nDefaultRows, 3, 25);
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if (this.cbScreen == 1024 && this.cpu) {
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/*
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* NOTE: We deliberately set the guard address to the LAST byte of the 2K
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@ -466,7 +470,6 @@ C1PVideo.prototype.writeByte = function(offset, b)
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{
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var col = offset % this.nCols;
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var row = Math.floor(offset / this.nCols);
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// if (b == 0) this.cpu.halt(); // I must have been testing something here...
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return this.updateWindow(col, row, b);
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};
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@ -807,8 +807,26 @@ X86CPU.prototype.reset = function()
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* the test. A nonzero value in EAX after self-test indicates that the particular 80386 unit is faulty.
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* If the self-test is not requested, the contents of EAX after RESET is undefined.
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*
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* DX holds a component identifier and revision number after RESET as Figure 10-1 illustrates. DH contains 3,
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* which indicates an 80386 component. DL contains a unique identifier of the revision level.
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* DX holds a component identifier and revision number after RESET as Figure 10-1 illustrates. DH contains
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* 3, which indicates an 80386 component. DL contains a unique identifier of the revision level.
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*
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* EFLAGS = 0x00000002
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* IP = 0x0000FFF0
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* CS selector = 0xF000 (base of 0xFFFF0000 and limit of 0xFFFF)
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* DS selector = 0x0000
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* ES selector = 0x0000
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* SS selector = 0x0000
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* FS selector = 0x0000
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* GS selector = 0x0000
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* IDTR = base of 0 and limit of 0x3FF
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*
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* All other 80386 registers are undefined after a reset (that is, Intel declined to document precisely how
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* the hardware initializes any other registers, as if that would stop everyone from making any assumptions).
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*
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* We've elected to set DX to 0x0304 on a reset, which is consistent with a 80386-C0, since we have no desire to
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* try to emulate all the bugs in older (eg, B1) steppings. At least not initially. We leave stepping-accurate
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* emulation for another day. It's also known that the B1 reported 0x0303 in DX, but other than the B1 and C0
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* steppings, it's not known exactly what other revision numbers Intel used in 80386 CPUs.
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*
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* We define some additional "registers", such as regLIP. which mirrors the linear address corresponding to
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* CS:IP (the address of the next opcode byte). In fact, regLIP functions as our internal IP register, so any
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@ -879,7 +897,7 @@ X86CPU.prototype.resetRegs = function()
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this.setSS(0);
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if (I386 && this.model >= X86.MODEL_80386) {
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this.regEDX = 0x0303; // Intel documentation indicates this is what an 80386-B1 reported
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this.regEDX = 0x0304; // Intel errata sheets indicate this is what an 80386-C0 reported
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this.regCR0 = X86.CR0.ET; // formerly MSW
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this.regCR1 = 0; // reserved
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this.regCR2 = 0; // page fault linear address (PFLA)
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@ -52,7 +52,7 @@ var X86Help = {
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* @this {X86CPU}
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* @param {number} dst (current value, ignored)
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* @param {number} src (new value)
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* @return {number} dst (src is overridden, replaced with regMD16, as specified by opMOVSegSrc)
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* @return {number} dst (src is overridden, replaced with regMD16, as specified by opMOVwsr())
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*/
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opHelpMOVSegSrc: function(dst, src) {
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return X86Help.opHelpMOV.call(this, dst, this.regMD16);
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@ -1937,21 +1937,21 @@ var X86OpXX = {
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var bModRM = this.getIPByte();
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var reg = (bModRM & 0x38) >> 3;
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switch (reg) {
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case 0x0:
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this.regMD16 = this.segES.sel;
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break;
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case 0x1:
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this.regMD16 = this.segCS.sel;
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break;
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case 0x0:
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this.regMD16 = this.segES.sel;
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break;
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case 0x1:
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this.regMD16 = this.segCS.sel;
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break;
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case 0x2:
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this.regMD16 = this.segSS.sel;
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break;
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case 0x3:
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this.regMD16 = this.segDS.sel;
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break;
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default:
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X86Help.opHelpUndefined.call(this);
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return;
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this.regMD16 = this.segSS.sel;
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break;
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case 0x3:
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this.regMD16 = this.segDS.sel;
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break;
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default:
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X86Help.opHelpUndefined.call(this);
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return;
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}
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/*
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* Like other MOV operations, the destination does not need to be read, just written.
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@ -97,7 +97,7 @@ function T(a,b,c,d){var e=!1;c||(a.ea[b]=null,a.za==b&&(a.za=0));var g=0,h=a.k[b
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f.bc=function(a,b){var c=Ga(this.l);if(!a)if(this.l.speed==this.l.Na)a=void 0!==b&&32<=this.Ec;else{var d=c-this.Md;a=0>d||d>=this.Xf}a&&(d=this.lc.shift(),void 0!==d&&(this.yd=d),this.Ec=0,this.Md=c);for(d=c=0;8>d;d++)this.zd&1<<d&&(c|=this.yd[d]);c^=this.rc;if(void 0!==b)this.a[b]=c;else if(b=this.Rd,c!=this.Ad)for(d=b;d<this.ag;d++)this.a[d]=c;this.Ad=c};y(function(){for(var a=F(window.document,"c1pjs","keyboard"),b=0;b<a.length;b++){var c=a[b],d=D(c),d=new La(d);E(d,c)}});
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function Ra(a,b,c,d){A.call(this,"C1PVideo",a);this.zc=a.model;this.Nd=a.charCols;this.Od=a.charRows;this.Lf=a.screenWidth;this.Mf=a.screenHeight;this.Pb=a.charWidth;this.Qb=a.charHeight;Sa(this);this.Rb=b;this.Jf=c;this.mb=d;this.kb=56832}C(Ra);f=Ra.prototype;f.reset=function(a){this.vb(this.zc);if(this.a)for(var b=this.Zb;b<this.Ic;b++)this.a[b]=a?Math.floor(256*Math.random()):32};
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f.J=function(a,b,c){switch(b){case "refresh":return this.s[b]=c,c.onclick=function(a){return function(){Ta(a);va(a)}}(this),!0}return!1};f.W=function(a,b,c,d){this.a=a;this.Zb=b;this.If=c-b+1;this.Ic=this.Zb+this.If;d&&(this.l=d,void 0!==this.kb&&(wa(d,this.kb,this.kb,this,this.I),N(d,this.kb,this.kb,this,this.P)));this.reset(!0)};
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function Sa(a,b,c,d,e){a.Wb=void 0!==b?b:a.Nd;a.Yf=void 0!==c?c:a.Od;a.Sa=a.Wb*a.Yf;a.Ic=a.Zb+a.Sa;a.Fd=void 0!==d?d:0;a.Pd=void 0!==e?e:c;a.Bd=Math.floor(a.Lf/a.Wb);a.Cd=Math.floor(a.Mf/a.Pd)}f.X=function(){this.Rb.focus()};f.vb=function(a){this.sb=a;600==this.sb?(Sa(this,this.Nd,this.Od,4,24),1024==this.Sa&&this.l&&(this.Lb=this.Ic+this.Sa-1,N(this.l,this.Lb,this.Lb,this,this.ne))):(this.i("updated video model: "+this.sb),Sa(this,64,32));Ta(this);va(this)};
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function Sa(a,b,c,d,e){a.Wb=void 0!==b?b:a.Nd;a.Yf=void 0!==c?c:a.Od;a.Sa=a.Wb*a.Yf;a.Ic=a.Zb+a.Sa;a.Fd=void 0!==d?d:0;a.Pd=void 0!==e?e:c;a.Bd=Math.floor(a.Lf/a.Wb);a.Cd=Math.floor(a.Mf/a.Pd)}f.X=function(){this.Rb.focus()};f.vb=function(a){this.sb=a;600==this.sb?(Sa(this,this.Nd,this.Od,3,25),1024==this.Sa&&this.l&&(this.Lb=this.Ic+this.Sa-1,N(this.l,this.Lb,this.Lb,this,this.ne))):(this.i("updated video model: "+this.sb),Sa(this,64,32));Ta(this);va(this)};
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f.ca=function(a,b){if(a&&!this.o.C&&K(this)){if(this.o.C=!0,this.m=L(b,"debugger"),this.H=L(b,"keyboard"))this.H.J("canvas","keyDown",this.Rb),this.H.J("canvas","keyPress",this.Rb),this.H.J("canvas","keyUp",this.Rb)}else!a&&this.o.C&&(this.o.C=!1)};f.Q=function(){this.Pb||(this.Pb=Math.floor(this.mb.width/16));this.Qb||(this.Qb=Math.floor(this.mb.height/16));A.prototype.Q.call(this)};
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f.I=function(a,b){var c=this.l.I(a);void 0!==b&&this.m&&S(this.m,this,a,b,this.m.Bb);this.l.P(a,c&127|(Math.floor(Ga(this.l)/8333)&1?128:0))};f.P=function(a,b){void 0!==b&&this.m&&S(this.m,this,a,b,this.m.Bb)};
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f.ne=function(a,b){if(void 0!==b){this.m&&S(this.m,this,a,b,this.m.Bb,!0);this.vb(540);this.H&&this.H.vb(542);var c=this.l,d=c.ua,e=[],g=xa(d,this.Lb,this.Lb,this,this.ne);if(0<=g){e.push(d[g][0]);e.push(d[g][1]);d.splice(g,1);for(var h=65536,k=0,g=0;g<d.length;g++)h>d[g][0]&&(h=d[g][0]),k<d[g][1]&&(k=d[g][1]);e.push(h);e.push(k)}4==e.length&&(c.Mb=e[2],c.Nb=e[3])}};function Ta(a){a.mc=Array(a.Sa);for(var b=0;b<=a.Sa;b++)a.mc[b]=-1}
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@ -93,7 +93,7 @@ function U(a,b,c,d){var f=!1;c||(a.R[b]=null,a.aa==b&&(a.aa=0));var g=0,k=a.j[b]
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e.Ya=function(a,b){var c=ya(this.t);if(!a)if(this.t.speed==this.t.pa)a=void 0!==b&&32<=this.tb;else{var d=c-this.kc;a=0>d||d>=this.Vd}a&&(d=this.cb.shift(),void 0!==d&&(this.Wb=d),this.tb=0,this.kc=c);for(d=c=0;8>d;d++)this.Xb&1<<d&&(c|=this.Wb[d]);c^=this.jb;if(void 0!==b)this.a[b]=c;else if(b=this.pc,c!=this.Yb)for(d=b;d<this.Xd;d++)this.a[d]=c;this.Yb=c};y(function(){for(var a=I(window.document,"c1pjs","keyboard"),b=0;b<a.length;b++){var c=a[b],d=G(c),d=new Ba(d);H(d,c)}});
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function Ga(a,b,c,d){B.call(this,"C1PVideo",a);this.pb=a.model;this.lc=a.charCols;this.mc=a.charRows;this.Kd=a.screenWidth;this.Ld=a.screenHeight;this.Ma=a.charWidth;this.Na=a.charHeight;Ha(this);this.Oa=b;this.Id=c;this.ta=d;this.qa=56832}E(Ga);e=Ga.prototype;e.reset=function(a){this.Ba(this.pb);if(this.a)for(var b=this.Va;b<this.xb;b++)this.a[b]=a?Math.floor(256*Math.random()):32};
|
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e.I=function(a,b,c){switch(b){case "refresh":return this.p[b]=c,c.onclick=function(a){return function(){Ia(a);qa(a)}}(this),!0}return!1};e.Q=function(a,b,c,d){this.a=a;this.Va=b;this.Hd=c-b+1;this.xb=this.Va+this.Hd;d&&(this.t=d,void 0!==this.qa&&(ra(d,this.qa,this.qa,this,this.O),O(d,this.qa,this.qa,this,this.M)));this.reset(!0)};
|
||||
function Ha(a,b,c,d,f){a.Sa=void 0!==b?b:a.lc;a.Wd=void 0!==c?c:a.mc;a.ia=a.Sa*a.Wd;a.xb=a.Va+a.ia;a.dc=void 0!==d?d:0;a.nc=void 0!==f?f:c;a.Zb=Math.floor(a.Kd/a.Sa);a.$b=Math.floor(a.Ld/a.nc)}e.ea=function(){this.Oa.focus()};e.Ba=function(a){this.ya=a;600==this.ya?(Ha(this,this.lc,this.mc,4,24),1024==this.ia&&this.t&&(this.Ia=this.xb+this.ia-1,O(this.t,this.Ia,this.Ia,this,this.Mc))):(this.u("updated video model: "+this.ya),Ha(this,64,32));Ia(this);qa(this)};
|
||||
function Ha(a,b,c,d,f){a.Sa=void 0!==b?b:a.lc;a.Wd=void 0!==c?c:a.mc;a.ia=a.Sa*a.Wd;a.xb=a.Va+a.ia;a.dc=void 0!==d?d:0;a.nc=void 0!==f?f:c;a.Zb=Math.floor(a.Kd/a.Sa);a.$b=Math.floor(a.Ld/a.nc)}e.ea=function(){this.Oa.focus()};e.Ba=function(a){this.ya=a;600==this.ya?(Ha(this,this.lc,this.mc,3,25),1024==this.ia&&this.t&&(this.Ia=this.xb+this.ia-1,O(this.t,this.Ia,this.Ia,this,this.Mc))):(this.u("updated video model: "+this.ya),Ha(this,64,32));Ia(this);qa(this)};
|
||||
e.T=function(a,b){if(a&&!this.m.B&&J(this)){if(this.m.B=!0,this.D=L(b,"keyboard"))this.D.I("canvas","keyDown",this.Oa),this.D.I("canvas","keyPress",this.Oa),this.D.I("canvas","keyUp",this.Oa)}else!a&&this.m.B&&(this.m.B=!1)};e.K=function(){this.Ma||(this.Ma=Math.floor(this.ta.width/16));this.Na||(this.Na=Math.floor(this.ta.height/16));B.prototype.K.call(this)};e.O=function(a){var b=this.t.O(a);this.t.M(a,b&127|(Math.floor(ya(this.t)/8333)&1?128:0))};e.M=function(){};
|
||||
e.Mc=function(a,b){if(void 0!==b){this.Ba(540);this.D&&this.D.Ba(542);var c=this.t,d=c.U,f=[],g=sa(d,this.Ia,this.Ia,this,this.Mc);if(0<=g){f.push(d[g][0]);f.push(d[g][1]);d.splice(g,1);for(var k=65536,h=0,g=0;g<d.length;g++)k>d[g][0]&&(k=d[g][0]),h<d[g][1]&&(h=d[g][1]);f.push(k);f.push(h)}4==f.length&&(c.Ja=f[2],c.Ka=f[3])}};function Ia(a){a.eb=Array(a.ia);for(var b=0;b<=a.ia;b++)a.eb[b]=-1}
|
||||
function qa(a){var b=0;if(a.m.B)for(;b<a.ia;){var c=a.a[a.Va+b];if(a.eb[b]!=c){var d=Math.floor(b/a.Sa);if(d>=a.dc&&(d-=a.dc,d<a.nc)){var f=c*a.Ma;a.Id.drawImage(a.ta,f%a.ta.width,Math.floor(f/a.ta.width)*a.Na,a.Ma,a.Na,b%a.Sa*a.Zb,d*a.$b,a.Zb,a.$b)}a.eb[b]=c}b++}}
|
||||
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|
|
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Reference in a new issue