Video/Japanese Display Adapter
For High Quality Japanese Fonts
High quality Japanese Fonts on a screen. That's what IBM Japan pursued
for from beginning.
IBM PC started with MDA, Monochrome Display Adapter ( 720x350 text
only ) and CGA, Color Graphics Array ( 640 x200 2 colors ) in 1981.
In order to handle Japanese Kanji characters, Japanese PC manufacturers
developed their own video systems.
Most of the manufacturers used 640 x400 dots resolution using 16 x
16dots kanji fonts and those video systems were "company specific" and
were not compatible with each other. " Incompatibility among each
hardwares" required company specific MS-DOS too. There were various versions
of Japanese MS-DOS which could be used solely for specific PC.
IBM Japan decided to use high quality fonts in 24 x24 dots for their
PC, IBM Multi-Station series, and it required 1024 x 768 high resolution. ( IBM Japan also used 16
x 16 dots fonts for entry class models and these were designed for 720
x 512 dots resolution.)
Non-abliviated Kanji fonts in 24 x 24 dots were really beautiful and
basic concept about treatment of Japanese characters and video system of
Multi-Station series had been carried over to PS/55 Display Adapter II
and the video mode was called as PS/55 High Resolution mode. IBM
DOS J4.0 ( usually refereed as JDOS ) was one of above mentioned company
specific MS-DOS which was modified by IBM Japan to be used solely for PS/55s
with PS/55 Display Adapters.
||PS/55 D/A ----
||AX JEGA ------
PS/55 Japanese Display Adapters in Avec series were developed for 1st
generation of PS/55s such as 5570 and 5550 386ers which had VGA chip
on their planar.
Display Adapter ( LEO, is the code name for the
card ? )
Double Decked Card prepared for 5570-S. Don't have enough information
about this adapter.
II ( AVEC )
|P/N 38F4650 ( My memorandum shows different
P/N 94X1649 for DA II )
This adapter came with 5550-S/T. 512KB VIDEO
RAM on the PCB . additional 512KB VIDRAM can be
added through connector J1.
Display adapter III ( AVEC )
Adapter- IV ( AVEC ) P/N 38F7016
|P/N 38F7016 ( Also different P/N 79F5417 is written
in my log file )
Stock Video Adapter for 5530-Z ( and probably
for 5530-T )
Seems there are two types of IV adapter. Optional 512KB
VRAM can be added through connector J2.
Different P/N for optional VRAM are available. One is 38F7075 and the
other is 64F9668.
This adapter has VGA chip ( 90X8941)
but the connector is AVE.
When I noticed VGA chip on the card I thought this one was BVE card
because 5530-T/S didn't have VGA chip on the planar. Strange
card this one is.
V ( AVEC )
Stock Display adapter for 5551-S1/T1/V1 and 5571-V1
U2 38F4782 PG /TC110G38AF
U3 56F7478 PV /TC110G38CG
U4 38F4782 PG /TC110G38AF
U5 56F7478 PV /TC110G38CG
U7-13, 17- 48: 65X2554
U14 56F7477 PD /TC110G38AF
U15 54F7479 PC /TC110G17AF
U16 DAC 83X3208
|J1 60PIN Connector for
ZIP RAM below
Display Adapter B
I myself have not seen this card.
adapter B-II ( BVEC )
Older Version ( with ZIP type RAM )
Stock video adapter for 5541-T(386-20), 5561-W( 486-33),
5580-Y, ( and probably for 5551-Vxx )
U2 - U25 41465 ZIP
U27- U34 41465 ZIP
VRAM ( VGA ) M5M4464AL
U51 PG144-FP 38F4782PG
U52 PV144-FP 56F7478PV
U53 PG144-FP 38F4782PG
U54 PV144-FP 56F7478PV
U55 PD144-FP 56F7477PD
U56 PC144-FP 56F7479PC
ZIP RAM beside Y3 65X2554
J1 Solder pads(
Poss for VRAM
J2 Video Output
U10 VGA 90X8941
U12 ROS 79F5421
U22 56F7478/ TC110G38CG
|U23 79F5427 PD7/TC140G37AF
U24 54F7479 PC/TC110G17AF
U25 DAC INMOS IMSG176-J66
DBCS series were sold with newer desktop 486ers such
as 5551-N/Y/R/L, 5530-L, 5521-Y.
It is told that DBCS adapter family ( this one and Adapter/NI-J listed
below ) were designed to keep compatibility with PS/2 systems. I'm
not sure if these adapter don't need MONCHK.EXE when these are installed
At least AVEC family ( Adapter-II/III/V ) should be used with MONCHK.EXE
in autoexec.bat when these are used with PS/2 systems.
Stock video card for 5551-N/Y.
|U1-7 1M W/B
U8-9 1M B/W HM511664JP8
U10 Video 34G3196
U11 79F5427 PD7 /TC140G37AF
U12/15 1M B/W HM511664JP8
U13 1M ROS
U16 DAC Unable to identify
heat sink is glued )
U17 1M W/B HM511665JP8
U18 38F4782 PG/TC110G38AF
U19 56F7478 PV/TC110G38CG
U20 38F7482 PG/TC110G38AF
|U21 Unable to
heat sink is glued atop
of the chip
J1 Video Output
The last Japanese Display Adapter equipped in 5551-R/L and 5521-Y1B.
"NI" stands for "Non-Interlaced".
U11 ICS 9412
U16 INMOS IMSG176J-80
U18 Adapter ROM 85G7137
J1 Video Output
|Win95 and Japanese Display Adapter
Win 3.1J driver for PS/55 display adapter family could be used on Win95
in 1024x768 16 color
resolution but it's S-L-O-W. Basically these adapters
are for DOS ( and Win 3.1 ) operation.
For Japanese Readers, please see How
to use PS/55 Display adapter family under Win95.
Installing PS/55 Display Adapter DA-J on PS/2
Basically Japanese Display Adapters were designed to be used with IBM
Japan's specialized JDOS.
It was told that PS/55 DA with AVEC connector could not be used
with PS/2. BVEC family and DA-J family could be used
in PS/2. I'm not sure about this issue but I once used *some* card
with 8570 25MHz planar. I don't remember exactly which card I used.
Anyway in order to use Japanese D/A *compatible* with PS/2,
you need some trick to get color signal correctly.
for the trick.