TOAPLAN OUTZONE Repair Log

[Zabanitu]

this one came with corrupted sprites.
after i found how to read the 28 pin 1Mbit mask roms i've found they were 90% different than mame dump, one was also spitting out different data every read.
so i replaced the mask roms with 27c010 eproms, by finding the right jumper configuration just under the 4 eprom sockets.
have a look at the attachment too.

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replaced 23c1000 dip 28 mask rom with 27c010

original jumpers with mask rom
JP 7 (A16)

Jumper settings for dip 32 27c010 eprom replacement
JP 8 (/OE to gnd)
JP 9 (A16)

jumper for dip 32 27c301/27c1000
JP10 (/OE to gnd)
JP7 (A16)

*************************************************

***info from dataman forums ***
The 23c1000 was a maskrom made by NEC, it seems to be very common in some of the older arcade PCB's
Its complete name taken from the ROM is D23C1000AC and is a DIP package
The pinout is as follows:

A15.|1..........28|.VCC
A12.|2..........27|.A14
A7.|3...........26|.A13
A6.|4...........25|.A8
A5.|5...........24|.A9
A4.|6...........23|.A11
A3.|7...........22|.A16
A2.|8...........21|.A10
A1.|9...........20|./CE
A0.|10..........19|.D7
D0.|11..........18|.D6
D1.|12..........17|.D5
D2.|13..........16|.D4
GND.|14........15|.D3

As you can see its pin compatible with a 27c301 but with an the extra /OE and programming lines removed.
*** /info ***


(1M) 128k x 8 EPROM (NH27C301)
                    (NEC27C1000)
Vpp  1 +-v-+ 32  Vcc
OE   2 |   | 31  PGM/
A15  3 |   | 30  nc
A12  4 |   | 29  A14
A7   5 |   | 28  A13
A6   6 |   | 27  A8
A5   7 |   | 26  A9
A4   8 |   | 25  A11
A3   9 |   | 24  A16
A2  10 |   | 23  A10
A1  11 |   | 22  CE/
A0  12 |   | 21  D7
D0  13 |   | 20  D6
D1  14 |   | 19  D5
D2  15 |   | 18  D4
GND 16 +---+ 17  D3

(1M) 128k x 8 mask rom (TC53C1001)       JEDEC 128k x 8 EPROM 27C010

nc   1 +-v-+ 32  Vdd                    Vpp  1 +-v-+ 32  Vcc
A16  2 |   | 31  nc                     A16  2 |   | 31  pgm/
A15  3 |   | 30  nc                     A15  3 |   | 30  nc
A12  4 |   | 29  A14                    A12  4 |   | 29  A14
A7   5 |   | 28  A13                    A7   5 |   | 28  A13
A6   6 |   | 27  A8                     A6   6 |   | 27  A8
A5   7 |   | 26  A9                     A5   7 |   | 26  A9
A4   8 |   | 25  A11                    A4   8 |   | 25  A11
A3   9 |   | 24  OE/                    A3   9 |   | 24  OE/
A2  10 |   | 23  A10                    A2  10 |   | 23  A10
A1  11 |   | 22  CE/                    A1  11 |   | 22  CE/
A0  12 |   | 21  D7                     A0  12 |   | 21  D7
D0  13 |   | 20  D6                     D0  13 |   | 20  D6
D1  14 |   | 19  D5                     D1  14 |   | 19  D5
D2  15 |   | 18  D4                     D2  15 |   | 18  D4
GND 16 +---+ 17  D3                     GND 16 +---+ 17  D3

[porchy]

Nice one mate.
That was actually my post on the dataman forum as I got them to add it to the supported device list. Makes life a little easier.

[Zabanitu]

Nice to meet you here too !!!!
eheheh that repair job was quite a hunt... i reverse engineered the schematics and found the correct jumper configuration to change form mask rom to eprom pinout !
looooove hackin' !