RetroShock: Mega Drive/Genesis Printed Circuit Boards

RetroShock

TOC

Acclaim Entertainment
Accolade
Capcom
Codemasters
Electronic Arts
Konami
Namco
Sega
Taito
Tengen & Time Warner Interactive

Acclaim Entertainment

670100	8-Mbit with JEDEC pinout
670115	16-Mbit with JEDEC pinout
670120	16-Mbit with JEDEC pinout and 256 × 8-bit Serial EEPROM
670121	32-Mbit (2 × 16) with JEDEC pinout CE switching by A21 using a 74139 2- to 4-line decoder.
670128	16- or 32-Mbit with JEDEC or 27C322 pinout ROM type is selected by J1 and J2. Closed J1 configures a 32M 27C322, J2 a JEDEC type upto 16M.
210-0159-001	16-Mbit with JEDEC pinout

Accolade

ACSGBAT	16-Mbit with JEDEC pinout and 32,768 × 8-bit Static RAM
ACSGEE1191	16-Mbit with JEDEC pinout and 2,048 × 8-bit Parallel EEPROM
ACSGPC291	16-Mbit with JEDEC pinout
7100-00002	16-Mbit with JEDEC pinout (clone of ACSGPC291)

Capcom

93648-1

16-Mbit with JEDEC pinout (based on Sega 171-6329)

Codemasters

SR16V4	16-Mbit with JEDEC pinout
SR16V7	12-Mbit (4 + 8) with JEDEC (compliant) pinout CE switching on console reset (button) using a 7474 D-type flip-flop.

Electronic Arts

PWA P10001	8- or 16-Mbit with JEDEC pinout Capacity depends on the board revision: Upto Rev G = 8M, Rev H = 8M or 16M (patched), Rev J = 16M
PWA P10002	8- or 16-Mbit with JEDEC pinout and 8,192 × 8-bit Static RAM
PNN P10002	16-Mbit with JEDEC pinout and 8,192 × 8-bit Static RAM
PWA P10003	8-Mbit with JEDEC pinout and 128 × 8-bit Serial EEPROM
PWA P10004	8-Mbit with JEDEC pinout using little endian byte-ordering and 128 × 8-bit Serial EEPROM
PWA P10016	16-Mbit with JEDEC pinout and 32,768 × 8-bit Static RAM
PWA PN10017	32-Mbit (2 × 16) with JEDEC pinout CE switching by A21 using a 74138 3- to 8-line decoder. U2 is the first and U1 the second ROM.
PWB 4/8M	8-Mbit with JEDEC pinout and 8,192 × 8-bit Static RAM
PWB SC28X2	1-Mbit (2 × 0.5) with JEDEC pinout 2 × 8-bit ROM. U1 (bottom) serves D0-D7 and U2 (top) D8-D15.
PWB SC40X1	4-Mbit with JEDEC compliant pinout
PWB SC40X1B	4-Mbit with JEDEC compliant pinout and 8,192 × 8-bit Static RAM
PWB SC40X1,32X1	6-Mbit (4 + 2) with JEDEC (compliant) pinout CE switching by A19 using a 74138 3- to 8-line decoder. 8-bit ROM serves D0-D7.
PWB SC42X1	8-Mbit with JEDEC pinout

Konami

353536	16-Mbit with JEDEC pinout
353585	16-Mbit with JEDEC pinout using little endian byte-ordering

Namco

Sega

171-5702	4-Mbit (2 × 2) with JEDEC pinout 2 × 8-bit ROM. Bottom serves D0-D7 and top D8-D15.
171-5703	4-Mbit with JEDEC compliant pinout
171-5841	5-Mbit (1 + 4) with JEDEC (compliant) pinout CE switching by A17 using a 74139 2- to 4-line decoder.
171-5919	4-Mbit with JEDEC compliant pinout and 8,192 × 8-bit Static RAM
171-5921	8-Mbit (2 × 4) with JEDEC compliant pinout and 8,192 × 8-bit Static RAM CE switching by A19 using a 74139 2- to 4-line decoder.
171-5927	1-Mbit with JEDEC pinout
171-5944	5-Mbit (1 + 4) with JEDEC (compliant) pinout and 8,192 × 8-bit Static RAM CE switching by A17 using a 74139 2- to 4-line decoder.
171-5955	8-Mbit with JEDEC pinout and 8,192 × 8-bit Static RAM
171-5978	8-Mbit with JEDEC pinout
171-5979	8-Mbit (2 × 4) with JEDEC compliant pinout CE switching by A19 using a 74139 2- to 4-line decoder.
171-6021	8-Mbit with JEDEC pinout and 32,768 × 8-bit Static RAM
171-6111	8-Mbit with JEDEC pinout and 128 × 8-bit Serial EEPROM
171-6206	4-Mbit with JEDEC compliant pinout (based on 171-5703)
171-6278	16-Mbit with JEDEC pinout and 8,192 × 8-bit Static RAM
171-6279	16-Mbit with JEDEC pinout and 32,768 × 8-bit Static RAM (based on 171-6021)
171-6304	4-Mbit with JEDEC compliant pinout and 128 × 8-bit Serial EEPROM (based on 171-6111)
171-6329	16-Mbit with JEDEC pinout
171-6330	16-Mbit (2 × 8) with JEDEC pinout CE switching by A20 using 7400 NAND gates.
171-6570	32-Mbit (2 × 16) with JEDEC pinout CE switching by A21 using 7400 NAND gates.
171-6572	32-Mbit (2 × 16) with JEDEC pinout and 32,768 × 8-bit Static RAM CE switching by A21 using a 74139 2- to 4-line decoder. Switching between SRAM and IC2 using TIME (0xA130Fx area) and D0.
171-6584	16-Mbit with JEDEC pinout and 128 × 8-bit Serial EEPROM (based on 171-6111)
171-6587	16-Mbit (2 × 8) chip-on-board CE switching by A20 using some built-in logic of the left COB.
171-6658	16-Mbit with JEDEC pinout and 512 × 8-bit Ferroelectric RAM
171-7147	32-Mbit with 27C322 pinout

Taito

J9100226A

4-Mbit with JEDEC compliant pinout

Tengen & Time Warner Interactive

800057-02	8-Mbit with JEDEC pinout
800068-01	16-Mbit with JEDEC pinout
800070-01	32-Mbit (2 × 16) with JEDEC pinout CE switching by A21 using 7400 NAND gates.

Clones

Some boards got re-/debranded without altering the layout. On the left are the clones and on the right the originals.

Sega of America	171-5978B-8/16	Tengen	800068-01 REV A
Midway	670128-1 REV 1	Acclaim	670128 REV 1
Namco	Unnamed (4M DIP)	Sega	171-5703
Takara	SA-8	Sega	171-5978BA
Takara	SA-12	Sega	171-6331A