@8FDA.ADF IBM XGA-2 Display Adapter/A
C8FDA.ADF Init file for @8FDA.ADF
194-255 Multimedia Products - MXGA Display Device Driver (by Software 2000)
XGA Drivers & Utilities
XGA Common Information
Nth Double Edge
Nth Double Edge Back
Adapter ROM
MXGA Driver Information
Nth Double Edge "FAB-N0016-000" (dual 2 MB NAT03 shown)

P3 HD15 video connector A
P4 HD15 video connector B
SW1 4x DIP switch (?)
U2,19 33G0329(ESD) RAMDAC (heatsinked)
U3,18 MT5C2568DJ-15 32Kx8 SRAM
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U4,5,13,14 TMS55165DGH-80 256Kx16 DRAM
U7 4.000 MHz osc
U9,16 50G5725 XGA-2 controller
U22 27C256-15/L video BIOS ROM
U37 PAL
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Each of the two XGA-2 controllers is paired with 2 MB
of video RAM. Some unofficial drivers
can utilize this larger memory.
Nth Double Edge Back

U48-51 TMS55165DGH-80 256Kx16 DRAM
Adapter ROM
1x 27C256-15 32Kx8 CMOS EPROM, PLCC-32 (U22)
Nth_BIOS_v05 Nth Graphics Rev 0.5 (non-zero checksum — F2h)
Nth_BIOS_v07 Nth Graphics Rev 0.7 (non-zero checksum — 58h)
The ROM contains two separate code sections:
- a custom code by Nth Graphics (located at the beginning of the ROM)
- a slightly modified XGA-2 v3.00 code
(relocated to ROM offset 6000h; contains one modified routine and an additional entry routine to test ROM section switching).
Normally only the XGA-2 portion of the ROM is mapped to the host's address
space (C000h by default). The mapping can be switched to the Nth section (and
back) using a ROM paging register idx 71h. The Nth section does not contain the
55AAh ROM "magic" and doesn't act as a standalone BIOS video ROM extension.
It's only referenced (and temporarily activated) by the modified XGA section.
See THIS code example for more
information.
MXGA Driver Information
Source: 194-255 Announcement Letter
Multiple XGA (MXGA) Display Device Driver P/N 83G8292
The IBM Multiple XGA Display Device Driver will run in any environment in
which the corresponding XGA-2 Device Drivers operate:
- OS/2 2.1, or later
- Windows 3.1
The IBM Multiple XGA Display Device Driver will support the following
products from Nth Graphics that have two complete XGA-2 chip sets on a single
graphics card:
- NAT01 — MCA with 1 MB of VRAM
- NAT02 — ISA with 1 MB of VRAM
- NAT03 — MCA with 2 MB of VRAM
- NAT04 — ISA with 2 MB of VRAM
It is possible to install as many as four of these cards in an ISA bus PC or
Micro Channel architecture bus computer to obtain eight accelerated graphics
displays operating in one PC.
Source: The Driver Manual (PC Mag, 12 Sep 1995)
Product Name | Nth Double Edge |
Accelerator Chip | IBM XGA II |
Driver (name, version) | mxga10.drv, Ver. 1.0B |
16-bit Driver | Yes |
32-bit VXD | Yes |
Win 95 Compatible | No |
Win 95 Update Driver | None |
Win 95 Driver Built-in | Yes |
Win 95 Driver On-line | No |
Windows NT Driver | None |
OS/2 Warp 3.0 Driver | mxga driver |
Double Edge Experiences
Ryan Alswede said:
QBMCA Id's the card as XGA-2, it boots with the XGA-2 ADF and NT
driver detects it as XGA-2 allowing full 16-bit color as well out of Port A.
Port B shows no video signal.
Christian Holzapfel said:
Linux just does it! I'm on my 8595-P200 with Debian 3.0 "Woody", a
Kernel 2.2 and XFree86 3.3.6.
Adjusted my XF86Config to an XGA-2, said it had 2 MB of memory, and asked it
to do 1024x768 at 16 bpp. Picture came out brilliant, check out the X11 stats
and the nice color fading of the background. Monitor reports it's still doing
a 70 Hz refresh.
See the critical section of the config HERE.
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