The Impression/3/M page is up:
https://ardent-tool.com/video/Matrox_Impression.html
(M80s would be proud xD)

More to come...

Tom, WTtF? Shadowing the VGA BIOS? I am kontuzed.

NamedItem Prompt "MGA on-board VGA"

choice " VGA Enabled " pos[1]=XXXX0XXXb mem 0c0000h-0c7fffh
choice " VGA Disabled " pos[1]=XXXX1XXXb

Help

"Select 'VGA Enabled' if you want a single screen solution.
This setting enables the VGA bios at C0000h (on the MGA adapter)."

There are two alternatives to using RAMBIOS.SYS. The first method uses
your computer system's ability to shadow a VGA BIOS. If your system
supports this capability, it is usually accomplished through the
system's configuration program. There are certain instances where this
method may not work. The second method is to use a memory manager to
shadow the BIOS.

Tomas Slavotinek wrote:
> The Impression/3/M page is up:
> https://ardent-tool.com/video/Matrox_Impression.html

Tom, I will extract and prepare the section with the ADF.

Tomas Slavotinek wrote:
> The Impression/3/M page is up:
> https://ardent-tool.com/video/Matrox_Impression.html
> (M80s would be proud xD)
>
> More to come...

Two versions of @80ec.ADF exist. The significant difference is the
presence of a Z-Buffer Item in ver 0.02, and what seems to be disabling
the Z-Buffer in ver 1.00 under "Fixed Resources"

"Matrox MGA Video Adapter (V0.02)"
"Matrox MGA Video Adapter (V1.00)"

AdapterId 80ECh "Matrox MGA Video Adapter (V0.02)"

NumBytes 2

NOTE: No "Fixed Resources" for ver 0.02

AdapterId 80ECh "Matrox MGA Video Adapter (V1.00)"

NumBytes 2

FixedResources
pos[1]=XX0XXXXXb

NOTE: This masks the Zbuffer enable bit to "Disabled". Also, the
"Zbuffer" item is removed from ver 1.00

Enable/Disable Adapter
" Adapter Enabled " pos[0]=XXXXXXX1b
Adapter Disabled pos[0]=XXXXXXX0b

NOTE: Same for 0.02 and 1.00 (duh!)

Help Enabled (normal use). Disabled if you are not using the adapter and
enabling it causes a conflict with another device.

Memory Mapping
" Map2 C8000 " pos[1]=XXXXX010b mem 0c8000h-0cbfffh
Map3 CC000 pos[1]=XXXXX011b mem 0cc000h-0cffffh
Map4 D0000 pos[1]=XXXXX100b mem 0d0000h-0d3fffh
Map5 D4000 pos[1]=XXXXX101b mem 0d4000h-0d7fffh
Map6 D8000 pos[1]=XXXXX110b mem 0d8000h-0dbfffh
Map7 DC000 pos[1]=XXXXX111b mem 0dc000h-0dffffh
Map1 AC000 pos[1]=XXXXX000b

Help There are 7 16K windows where you can map the MGA.
Note: Use Map1 only if the on-board VGA is enabled.

NOTE: ver 1.00 removes Map1 (AC000), only 6 16k windows (duh!)

MGA on-board VGA
" VGA Enabled " pos[1]=XXXX0XXXb mem 0c0000h-0c7fffh
VGA Disabled pos[1]=XXXX1XXXb

Help Select 'VGA Enabled' if you want a single screen solution.
This enables the VGA bios at C0000h (on the MGA adapter).

NOTE: Same for 0.02 and 1.00

Composite SYNC
" CSYNC Disabled " pos[1]=XXX0XXXXb
CSYNC Enabled pos[1]=XXX1XXXXb

Help Select 'CSYNC Enabled' if you are using a composite sync monitor.

NOTE: Same for 0.02 and 1.00

Zbuffer
" Zbuffer Absent " pos[1]=XX0XXXXXb
Zbuffer Present pos[1]=XX1XXXXXb

Help 'Zbuffer Present' if your MGA has it's ZIP memory installed
on the sockets placed on the lower left area of the adapter. Default is
'Zbuffer Absent'.

NOTE: 1.00 removes the "Zbuffer" item -AND- adds a "Fixed Resources"
line to mask the Zbuffer enable bit to "Disable"

Now that the memory settings have been exposed...

I am not an EE, nor did I sleep at "Holiday Inn Express" last night...

"Memory Mapping" is the window used to move video information between
system main memory and the Matrox MGA.

Map1 (AC00) is used if the "on-board VGA is enabled". But why is this
choice removed in ver 1.00? Also, WHICH "on-board VGA" is enabled? The
system VGA?

"MGA on-board VGA" has ONE option, stuff the MGA VGA BIOS into
C000-C7FF. "on-board VGA" and "MGA on-board VGA" appear to be different.

RAMBIOS.SYS might be for other MCA systems (non-PS/2) which cannot
"shadow" the MGA VGA BIOS. -OR- possumbly, handle the possumbility that
the system-board VGA -MUST- use C000-C7FF.

Memory Mapping
" Map2 C8000 " pos[1]=XXXXX010b mem 0c8000h-0cbfffh
Map3 CC000 pos[1]=XXXXX011b mem 0cc000h-0cffffh
Map4 D0000 pos[1]=XXXXX100b mem 0d0000h-0d3fffh
Map5 D4000 pos[1]=XXXXX101b mem 0d4000h-0d7fffh
Map6 D8000 pos[1]=XXXXX110b mem 0d8000h-0dbfffh
Map7 DC000 pos[1]=XXXXX111b mem 0dc000h-0dffffh
Map1 AC000 pos[1]=XXXXX000b

Help There are 7 16K windows where you can map the MGA.
Note: Use Map1 only if the on-board VGA is enabled.

NOTE: ver 1.00 removes Map1 (AC000), only 6 16k windows (duh!)

MGA on-board VGA
" VGA Enabled " pos[1]=XXXX0XXXb mem 0c0000h-0c7fffh
VGA Disabled pos[1]=XXXX1XXXb

Help Select 'VGA Enabled' if you want a single screen solution.
This enables the VGA bios at C0000h (on the MGA adapter).

> There are two alternatives to using RAMBIOS.SYS. The first method uses
> your computer system's ability to shadow a VGA BIOS. If your system
> supports this capability, it is usually accomplished through the
> system's configuration program. There are certain instances where this
> method may not work. The second method is to use a memory manager to
> shadow the BIOS.
>
> Tomas Slavotinek wrote:
>> The Impression/3/M page is up:
>> https://ardent-tool.com/video/Matrox_Impression.html