Remembering COMPAQ
This commit is contained in:
Jeff Parsons
parent
1ea01683f9
commit
1c04ada64b
26 changed files with 196 additions and 92 deletions
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@ -1,5 +1,5 @@
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;
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; ROM BIOS for Compaq DeskPro 386-16
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; ROM BIOS for COMPAQ DeskPro 386-16
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; Rev J.4, from parts 109592-001 and 109591-001, dated '01/28/88'
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; (C)Copyright COMPAQ Computer Corporation 1982,83,84,85,86,87-All rights reserved.
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;
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@ -42,7 +42,7 @@
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; replacing the ROM in the first megabyte with write-protected RAM; the top 64Kb of that
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; RAM must first be initialized with the 64Kb at %000F0000 prior to remapping. It's also
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; possible to copy external ROMs from %000C0000 through %000EFFFF into the bottom 64Kb of
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; that RAM, but this is only done for ROMs known to contain relocatable code; eg, a Compaq
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; that RAM, but this is only done for ROMs known to contain relocatable code; eg, a COMPAQ
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; Video Graphics Controller (VGC) Board.
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;
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; Every DeskPro 386 system must have a MINIMUM of 1Mb of RAM, of which either 256Kb,
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@ -52,9 +52,9 @@
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; is used by the "RAM Relocation" feature. The remaining memory immediately below that
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; 128Kb (ie, below %00FE0000) can only be accessed by special system software, such as CEMM.
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;
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; Compaq refers to that remaining memory as "Compaq Built-in Memory".
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; COMPAQ refers to that remaining memory as "Compaq Built-in Memory".
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;
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; As the Compaq 386/25 TechRef explains:
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; As the COMPAQ 386/25 TechRef explains:
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;
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; A data structure in memory indicates how much of the COMPAQ Built-in Memory (F40000h
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; to FE0000h) is [available and] in use. This memory is allocated downward (decreasing
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@ -244,7 +244,7 @@ x80b3: xor dx,dx ; 000080B3 33D2 '3.'
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;
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; Returns ZF set if successful
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;
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; See Compaq 386/25 TechRef, p.4-98 for details
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; See COMPAQ 386/25 TechRef, p.4-98 for details
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;
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x80e2: push bx ; 000080E2 53 'S'
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push cx ; 000080E3 51 'Q'
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@ -4803,7 +4803,7 @@ xa9e9: cs rep movsw ; 0000A9E9 F32EA5 '...'
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call xc259 ; 0000A9FD E85918 '.Y.'
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;
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; Set bit 2 (reserved?) and bit 4 (memory size?) of ROM BIOS Video Mode Options byte @40:0087.
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; It would appear that Compaq had a different conception of this byte; however, in the case of an
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; It would appear that COMPAQ had a different conception of this byte; however, in the case of an
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; adapter like the IBM VGA, it doesn't matter, since the IBM VGA ROM will rewrite this byte anyway.
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;
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or byte [0x87],0x14 ; 0000AA00 800E870014 '.....'
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@ -10383,7 +10383,7 @@ xdabb: push bx ; 0000DABB 53 'S'
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out 0x84,al ; 0000DAC0 E684 '..'
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;
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; This is special: move BL into AL, and then move AL back into BL.
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; We'll give Compaq the benefit of the doubt and assume this is macro nonsense.
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; We'll give COMPAQ the benefit of the doubt and assume this is macro nonsense.
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;
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mov al,bl ; 0000DAC2 8AC3 '..'
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mov bl,al ; 0000DAC4 8AD8 '..'
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@ -10454,7 +10454,7 @@ xdb31: pop bx ; 0000DB31 5B '['
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;
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; We then proceed to test the 128Kb starting at %FE0000 through %FFFFFF (the top of the 16Mb range),
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; which is where this ROM (and potentially other ROMs) will be copied and then mapped to %0E0000
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; through %0FFFFF. Compaq refers to this as "relocatable RAM".
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; through %0FFFFF. COMPAQ refers to this as "relocatable RAM".
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;
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; On the second call (from xdb16), AH is 0x02 (the first 64Kb block after the first 128Kb), and on
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; successful completion of that call, "00768 KB OK" will be displayed, referring to the first 640Kb
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@ -10464,7 +10464,7 @@ xdb31: pop bx ; 0000DB31 5B '['
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; successfully tests another 1024Kb, a total of "01792 KB OK" will be displayed.
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;
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; There appears to be a fourth call (from xd82e), where AH is 0xF0 (the first 64Kb of the last 1Mb
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; of the first 16Mb); we place no memory there, and Compaq memory maps typically show no memory there,
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; of the first 16Mb); we place no memory there, and COMPAQ memory maps typically show no memory there,
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; so I'm not sure what that's all about. -JP
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;
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xdb33: push bx ; 0000DB33 53 'S'
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@ -12978,7 +12978,7 @@ xf494: mov al,0x0 ; 0000F494 B000
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;
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; When we arrive here, the A20 line has been disabled; on most systems, that would
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; mean that the ROM's GDT would only be accessible at the "low" ROM address (%0F0730),
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; not the "high" address (%FF0730). But fortunately, A20 management on Compaq
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; not the "high" address (%FF0730). But fortunately, A20 management on COMPAQ
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; DeskPros affects wrap-around only from the 1st to the 2nd megabyte; no other address
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; range is affected.
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;
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@ -1,12 +1,12 @@
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---
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layout: page
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title: Compaq Portable III ROMs
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title: COMPAQ Portable III ROMs
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permalink: /devices/pc/rom/compaq/bios/portable3/
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redirect_from:
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- /devices/pc/bios/compaq/portable3/
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---
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Compaq Portable III ROMs
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COMPAQ Portable III ROMs
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---
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### System ROM Locations
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