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Added disk image of VGA tests/samples

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This commit is contained in:
Jeff Parsons 2015-07-09 12:33:01 -07:00
commit a10ac83df6
7 changed files with 28 additions and 322 deletions
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blog/2015/06/01/README.md
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@ -63,21 +63,12 @@ never completed, and this is another related issue that will have to be resolved
---
Another problem: during IBM VGA ROM initialization, a "missing readByte handler" warning occurs.
Card.setMemoryAccess(0x1510): missing readByte handler
stopped (2351185 ops, 7740201 cycles, 1617 ms, 4786766 hz)
EAX=00000204 EBX=0000194A ECX=00000001 EDX=000003C4
ESP=000000C4 EBP=FFFF0000 ESI=00000000 EDI=000003D4
SS=0030 DS=0000 ES=C000 FS=0000 GS=0304 PS=00000002 V0 D0 I0 T0 S0 Z0 A0 P0 C0
C000:1205 FEC0 INC AL
Before debugging this though, I decided to first make a table of all the register values for most of the modes that
the IBM VGA supports:
While debugging and fixing assorted IBM VGA issues, I made a table of all the register values for the video
modes commonly used on the IBM VGA. Here's that table:
INT 0x10 Mode Requested: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x0D 0x0E 0x10 0x12 0x13
BIOSMODE: 0x01 0x01 0x03 0x03 0x04 0x04 0x06 0x12 0x12 0x12 0x12 0x13
BIOSMODE: 0x01 0x01 0x03 0x03 0x04 0x04 0x06 0x0D 0x0E 0x10 0x12 0x13
CRTC[0x00]: HTOTAL 0x2D 0x2D 0x5F 0x5F 0x2D 0x2D 0x5F 0x2D 0x5F 0x5F 0x5F 0x5F
CRTC[0x01]: HDISP_END 0x27 0x27 0x4F 0x4F 0x27 0x27 0x4F 0x27 0x4F 0x4F 0x4F 0x4F
CRTC[0x02]: HBLANK_START 0x28 0x28 0x50 0x50 0x28 0x28 0x50 0x28 0x50 0x50 0x50 0x50
@ -138,13 +129,8 @@ the IBM VGA supports:
ATC[0x12]: PLANES 0x0F 0x0F 0x0F 0x0F 0x03 0x03 0x01 0x0F 0x0F 0x0F 0x0F 0x0F
ATC[0x13]: HPAN 0x08 0x08 0x08 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
In the process of building this table, I also discovered that INT 0x10 mode 0x0D display is garbled, and that all
graphics modes >= 0x0D are misdetected as BIOSMODE 0x12.
All these issues are under investigation.
In addition, I've created a [VGA Tests](/tests/pc/vga/) directory to hold VGA test and sample code that I want PCjs
to run successfully. See that directory for more details.
In addition, I've created a [VGA Tests](/tests/pc/vga/) directory to hold VGA test and sample code that PCjs can
now successfully run (for the most part). See that directory for more details.
*[@jeffpar](http://twitter.com/jeffpar)*
*June 1, 2015 (Updated July 3, 2015)*
*June 1, 2015 (Updated July 9, 2015)*