Introduction
AVEC Series (16-bit w/ AVE)
   Display Adapter II (old)
   Display Adapter II (new)
   Display Adapter III
   Display Adapter IV
     Display Adapter IV Daughter Card
   Display Adapter V
BVEC Series (16-bit w/ BVE)
   Display Adapter B-II (old)
   Display Adapter B-II (new)
DBCS Series (32-bit w/ BVE)
   DBCS Display Adapter/J
   DBCS Display Adapter/NI-J
Display Modes
Video Connector
   Video Connector Pinout
Japanese Display Adapters and Win95
Japanese Display Adapters and PS/2s

Content created by Sandy and Major Tom.

Introduction

High quality Japanese Fonts, that's what IBM Japan pursued from the very beginning.
   The original IBM PC was introduced together with MDA - Monochrome Display Adapter (720x350 text only) and CGA - Color Graphics Array (640x200 2 colors) in 1981. In order to handle Japanese Kanji characters, Japanese PC manufacturers developed their own video systems. Most of the manufacturers used 640x400 dots resolution using 16x16-dot Kanji fonts, but these video systems were company-specific and were not compatible with each other. As a result of this incompatibility, every company shipped its machines with a manufacturer-specific version of MS-DOS.
   IBM Japan decided to use high quality 24x24-dot fonts for their Multistation computer line that required 1024x768 resolution. (IBM Japan also used 16x16 dots fonts for entry-level models and these were designed for a resolution of 720x512 pixels.)
   The full (non-abbreviated) Kanji fonts with 24x24 dot characters were really beautiful and the basic concepts about the treatment of Japanese characters and the video system of the Multistation series had been carried over to PS/55 Display Adapter II and the video mode was known as PS/55 High-resolution mode. IBM DOS J4.0 (usually referred to as JDOS) was one of the previously mentioned company-specific versions of MS-DOS. In this case, modified by IBM Japan to be used solely for the PS/55 line and its PS/55 Display Adapters.

	1981	1982	1983		1984		1987			1990
IBM US	MDA & CGA	—	—		EGA		VGA	8514/A		XGA
	640x200 2C, 4C				640x350 6C		640x480 16C	1024x768 256C		1024x768 256C
IBM JP	—	—	Multistation 5550		—		PS/55 D/A			XGA VGA DOS/V
			1024x768 16C				1024x768 16C, 256C			1024x768 640x480 16C/256C
NEC &	—	NEC PC9801			—		AX JEGA			VGA DOS/V
Others		640x400 16C					640x480 16C			640x480 256C

AVEC Series (16-bit w/ AVE)

The AVEC series of Japanese Display Adapters was developed for the 1st-gen PS/55s such as the 5570 and 5550 386 machines that had a VGA subsystem on the planar.

The adapters come with 1MB VRAM on board in the stock configuration (except for Display Adapter IV).

Product	P/N	E/C	Shipped with	EC # -> alternative parts
DA	94X0968	?	5570S	ECC13008 -> 38F4650
DA II	79F0114	C13008A-C13008C	5570S	ECC64642H -> C13008F
DA III	79F0116	C13008A - C13008E	5570S	ECC64642H -> C13008F
DA III	79F0116	C13008F	5570S
DA II	94X1649	341648A - 341648E	5550S/T/V, 5570T/V	ECC64642E -> C27285C
DA II	38F4650	341964A - 341964C	5550S/T/V, 5570T/V	ECC64642E -> C27285C
DA III	64F8907	C27285A - C27285B	5550S/T/V, 5570T/V	ECC64642E -> C27285C
DA III	64F8907	C27285C	5550S/T/V, 5570T/V
DA IV	38F7016	C13500A - C13500B	5530S/T	ECC64642G -> C13500C
DA IV	38F7016	C13500C	5530S/T
DA V	56F7520	?	5550S/T/V, 5570T/V

The table has been borrowed from HERE (modified).

Display Adapter (codename LEO?, P/N?)

Triple deck card intended for model 5570-S.

Not information about this adapter. Please contact me if you have this card.

Display Adapter II (old) (P/N 38F4650)

F1 Fuse (see HERE) J1? 60-pin Connector for VRAM module? J2? 40-pin Connector for Font ROM module? J18 Video Connector (see HERE) U2-7,9,10 65X2554 (41465) U11,13 65X1194 PG / TC110G38AF U12,14 65X1195 PV / TC110G38CG

U15 94X1320 FONT U16-47 65X2554 (41465) U48 94X5608 PC / TC110G17AF U51 65X1193 PD / TC110G38AF U52 Bt453KPJ66 RAMDAC Y1 58.000 MHz Osc

Custom logic implemented using the Toshiba TC110G CMOS gate arrays.

Stock video adapter for model 5550-S/T.

Display Adapter II (new) (P/N 94X1649?)

F1 Fuse (see HERE) J1 60-pin Connector for VRAM module? J2 40-pin Connector for Font ROM module? J3 Video Connector (see HERE) U1 94X1320 FONT U2,4 38F4782 PG / TC110G38AF

U3,5 56F7478 PV / TC110G38CG U6-13 65X2554 (41465) U17-48 65X2554 (41465) U14 56F7477 PD / TC110G38HS U15 56F7479 PC / TC110G17HS U16 83X3208 RAMDAC

Custom logic implemented using the Toshiba TC110G CMOS gate arrays.

Display Adapter III (P/N 56F7520)

F1 Fuse (see HERE) J1 60-pin Connector for VRAM module? J2 40-pin Connector for Font ROM module? J3 Video Connector (see HERE) U1 94X1320 FONT U2,4 38F4782 PG / TC110G38AF

U3,5 38F4781 PV / TC110G38CG U6-13 65X2554? (41465) U17-48 65X2554? (41465) U14 56F7477 PD / TC110G38AF U15 56F7479 PC / TC110G17AF U16 83X3208 RAMDAC

Custom logic implemented using the Toshiba TC110G CMOS gate arrays.

Display Adapter IV (P/N 38F7016, my log says P/N 79F5417)

J1 40-pin Connector for Font ROM module? J2 80-pin Connector for VRAM module J3 Video Connector (see HERE) U1-14 65X2554? (41465) U15,19,22,25,28,31,32,34 M5M4464AL-12 U16 90X8941 VGA U17-18 65X2554 (41465?) U20,21,23,24,26,27,29,30 65X2554 (41465?) U33 83X3208 RAMDAC

U35 38F4782 PG / TC110G38AF U36 38F4781 PV / TC110G38CG U37 38F4780 PD / TC110G38AF U38 38F4783 PC / TC110G17AF U39 94X1320 FONT Y1 28.322 MHz Osc Y2 39.272 MHz Osc Y3 25.175 MHz Osc

Custom logic implemented using the Toshiba TC110G CMOS gate arrays.

Stock Video Adapter for 5530-Z (and probably for 5530-T). Two types of this adapter exist.
512 KB video RAM on the PCB, additional 512 KB can be added through connector J1.

This adapter comes with a VGA chip on board (90X8941) but has the AVE connector, rather than BVE as one would expect (5530-T/S doesn't have a VGA subsystem on the planar; Ed. Tom: maybe IBM wanted to make this adapter easy to use in other models with on-planar video?).

Display Adapter IV Daughter Card (P/N 38F7075?, P/N 38F7076, P/N 64F9668)

J1 80-pin Connector U2 56F7478 PV / TC110G38CG U3 38F4782 PG / TC110G38AF U4-19 65X2554? (41465)

Display Adapter V (P/N 56F7520)

F1 Fuse (see HERE) J1 60-pin Connector for VRAM module? J2 40-pin Connector for Font ROM module? J3 Video Connector (see HERE) U1 94X1320 FONT U2,4 38F4782 PG / TC110G38AF

U3,5 56F7478 PV / TC110G38CG U6-13 65X2554 (41465) U17-48 65X2554 (41465) U14 56F7477 PD / TC110G38AF U15 54F7479 PC / TC110G17AF U16 83X3208 RAMDAC

Custom logic implemented using the Toshiba TC110G CMOS gate arrays.

Stock video adapter for 5551-S1/T1/V1 and 5571-V1.

BVEC Series (16-bit w/ BVE)

Display Adapter B

No information about this adapter. Please contact me if you have this card.

Display Adapter B-II (Older Version, ZIP RAM, P/N 79F2159)

F1 Fuse (see HERE) J1 40-pin Connector (pads only) J2 Video Connector (see HERE) U1 90X8941 VGA U2-25 65X2554? (41465) U27-34 65X2554 (41465) U48 83X3208 RAMDAC U51,53 38F4782 PG / TC110G38AF U52,54 56F7478 PV / TC110G38CG U55 56F7477 PD / TC110G38AF

U56 56F7479 PC / TC110G17AF U57 94X1320 FONT VRAM M5M4464AL-12? (VGA) Y1 25.175 MHz Osc Y2 28.322 MHz Osc Y3 58.000 MHz Osc Y4 45.570 MHz Osc Y5 47.424 MHz Osc ZIP RAM below J1 65X2554 (41465)

Custom logic implemented using the Toshiba TC110G CMOS gate arrays.

Stock video adapter for 5541-T (386-20), 5561-W (486-33), 5580-Y (and probably for 5551-Vxx).

Display Adapter B-II (Newer Version, P/N 79F5413)

F1 Fuse (see HERE) J1 40-pin Connector (pads only) J2 Video Connector (see HERE) U1-7,18 HM511665JP8 64Kx16 DRAM U8,9 TC511664J-10 64Kx16 DRAM U10 90X8941 VGA U12 ROS 79F5421 / HN62408FPD55 8M ROM U14,15 HM511664JP8 64Kx16 DRAM U19,21 38F4782 PG / TC110G38AF

U20,22 56F7478 PV / TC110G38CG U23 79F5427 PD7 / TC140G37AF U24 56F7479 PC / TC110G17AF U25 INMOS IMSG176-J66 RAMDAC Y1 25.175 MHz Osc Y2 28.322 MHz Osc Y3 58.000 MHz Osc Y4 45.570 MHz Osc Y5 47.424 MHz Osc

Custom logic implemented using the Toshiba TC110G and TC140G CMOS gate arrays.

DBCS Series (32-bit w/ BVE)

The DBCS series of adapters was sold with the newer 486 desktops such as 5551-N/Y/R/L, 5530-L, 5521-Y.

DBCS Display Adapter/J (P/N 49G2000, FRU 07G0446)

Stock video card for 5551-N/Y.

F1 Fuse (see HERE) J1 Video Connector (see HERE) U1-7,17 1M W/B HM511665JP8 64Kx16 DRAM U8,9,12,15 1M BW HM511664JP8 64Kx16 DRAM U10 Video 34G3196 U11 79F5427 PD7 / TC140G37AF U13 8M ROS 79F5421 / HN62408FPD55 8M ROM U14 4M ROS (pads only) U16 89F5832 RAMDAC

U18,20 38F4782 PG / TC110G38AF U19,21 56F7478 PV / TC110G38CG U22 "BUSCON" 06G6722 Y1 45.570 MHz Osc Y2 58.000 MHz Osc Y3 47.424 MHz Osc Y4 25.175 MHz Osc Y5 28.322 MHz Osc Y6 41.5390 MHz Osc

Custom logic implemented using the Toshiba TC110G and TC140G CMOS gate arrays.

DBCS Display Adapter/NI-J "Non-Interlaced" (P/N 54G1464, FRU 54G1463)

J1 Video Connector (see HERE) U1,2,4,5 HM511664JP8 64Kx16 DRAM U3 662G8275 / HN62418FZ10 8M ROM U6,7,9,10 76G9119 U8 66G9060PGV2 / TC6217TF U11 ICS 9412 9128-42CW16 U12 34G3155

U13 54G1466 U14 79F5427 / TC140G37AF U15 "BUSCON" 06G6722 U16 INMOS IMSG176J-80 RAMDAC U18 85G7137 ROM Y1 14.318 MHz xtal

Some of the custom logic implemented using the Toshiba TC140G CMOS gate array.

The last Japanese Display Adapter shipped with models 5551-R/L and 5521-Y1B.

Display Modes

Resolution	Horizontal		Vertical		Pixel Clock	Mode Description
	Frequency	Polarity	Frequency	Polarity
1024x768i	46.08 kHz	Positive	116.2 Hz	Positive	58.000 MHz	PS/55 text mode
1024x768i	46.51 kHz	Positive	114.9 Hz	Positive	58.000 MHz	PS/55 graphic mode

   Please note that since the display modes are interlaced (except for the J-NI adapter) they may not be supported by some newer monitors (especially LCDs).

Video Connector

   All Japanese PS/55 display adapters described here feature the normal HD15 female connector used by most VGA adapters. The pinout and signals are mostly compatible with the standard analog VGA interface as well, with two notable differences:
   First - the PS/55 adapters don't implement the Display ID feature that normally uses pins 4, 11, 12, and 15 to identify the connected display unit. This alone however shouldn't cause any compatibility issues.
   The second, more important difference is the presence of 12 volts on pin 9. This voltage is used by some IBM monitors as a "power on" signal (for example the IBM 5574-C05/06/07 and M06/W06 monitors where it closes a normally opened power supply relay). Pin 9 is used as a "key" by most other period-correct monitors, so the voltage won't even reach the display unit, which means there's nothing to worry about in this case. However if your monitor does have this pin populated, be careful, as this could cause problems.
   Most PS/55 display adapters have a small fuse (typically marked "F1") that protects the 12 V supply from an overcurrent situation. So if the connected monitor overloads the 12 V line (i.e. by shorting it to ground), the fuse will blow. If this happens the adapter and the rest of the system should still operate normally, but the 12 V supply will be missing from the video connector (not really an issue, unless you intend to use one of the IBM monitors that use it as a "power on" signal). However with some of the newer monitors that expect 5 V on this pin, you could be less lucky and the higher voltage could damage the monitor! (even if the empirical evidence suggests otherwise...) To avoid any such issues use an extension cable that doesn't have pin 9 populated, or carefully remove it with a pair of nose pliers.

Video Connector Pinout

Pin	I/O	Signal
1	O	Red
2	O	Green
3	O	Blue
4	N/A	Reserved
5	N/A	Reserved
6	N/A	Red Ground
7	N/A	Green Ground
8	N/A	Blue Ground
9	O	+12 V (fused)
10	N/A	Digital Ground
11	N/A	Reserved
12	N/A	Reserved
13	O	H Sync
14	O	V Sync
15	N/A	Reserved

Japanese Display Adapters and Win95

   The PS/55 display adapter driver for Win 3.1J can be used with Win95 to get resolution of 1024x768 and 16 colors, but it's SLOW (these adapters are really intended to be used with DOS and Win 3.1). Japanese Readers, please see THIS if you want to known how to use the PS/55 Display Adapter family under Win95.

Japanese Display Adapters and PS/2s

   The Japanese Display Adapters were designed to be used with IBM Japan's specialized JDOS. It has been said that the AVEC display adapters can't be used with the PS/2 line, but the BVEC and DA-J adapters supposedly can. I'm not sure about these claims but I've once used one of the Japanese display adapters with the 8570 25 MHz planar. I don't remember exactly which card have I used. Anyway, in order to get color signal from one of the "PS/2 compatible" display adapters you will have to use the following trick.

   To get color image you have to add CHKMON.EXE to your AUTOEXEC.BAT (the utility can be also found on the Reference Diskette). This may be necessary only for adapters predating the DA B-II card, the later DBCS adapters may work out of the box, but I'm not sure. I've confirmed this using PS/2 Model 8570 with the 25MHz planar and D/A-III.