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@917A.ADF SVGA-CL28 Adapter/A (original Japanese ADF)
@917A.ADF SVGA-CL28 Adapter/A (modified English ADF)
Win9x/NT have built-in drivers.
Win9x built-in driver can detect 2 MB of VRAM and provides 1024 x 768 16-bit mode.
NT4 driver detects only 1 MB even if additional VRAM has been installed.
Cirrus GD542x SVGA Adapters
CL5428 SVGA/A Adapter
Adapter ROM
Circuit around GD5428 and LM334
Memory Upgrade
ADF Sections
CL5428 SVGA/A Adapter
FRU P/N 84G7001, P/N 84G7001, "IGH0879BA SVGA CARD", Made by Matsushita (Panasonic)
![[P]](/other/img/photo.gif "Front")
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C15 Capacitor 10/25A/40B ?
J1 HD15 video connector
U1 CL-GD5428-80QC-A
U2 ROM BIOS 84G7129
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U6 PALCE22V10H (dated 3/4/94)
U7,8 256Kx16 DRAM
U9,10 VRAM Solder pads
U11 LM334 Current Source
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U7,8
MT4C16257DJ-6,
µPD42S4260-70,
TC514260BJ-70,
HM514260DJ-6,
M514260ASL-70J
or compatible 256Kx16 DRAM
Originally equipped in PS/55 Model 5521-YSB/YWB.
Not available as an OBI.
Adapter ROM
M5M27C256AFP 32Kx8 OTP ROM (U2, soldered)
84G7129 SVGA-CL28 Adapter/A BIOS (26-May-1994)
"CL-GD542X VGA BIOS Version 1.41"
Circuit around GD5428 and LM334 (by T. Sunagawa)
This adapter is "Flicker Free" (the current source capacitor C15 is installed
with the correct polarity).
Compare with the 1MB Short SVGA (US/EMEA).
Memory Upgrade
This adapter can be upgraded to 2 MB of video RAM (soldering required).
Pin 14 of each unpopulated DRAM chip is already connected to pin 141 of
U1 (CL5428) through 100 ohm resistor R26 (Reply Video Board
uses 33 ohms resistor for this connection).
AdapterId 917A SVGA-CL28 Adapter/A
FixedResources
mem 0c0000h-0c7fffh
| ![[P]](JP_SVGA_Photo_Front.jpg "Front"){kind=small}
![[P]](JP_SVGA_Photo_Back.jpg "Back"){kind=small}
![[P]](JP_SVGA_Photo_Front_alt.jpg "Front (alt)"){kind=small}