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Joined: May 2017
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Dam0 Offline OP
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Hey all, thx for reading.....

ive got 3 x sets of ROMs, all from a same system to be dumped and added to MAME, but im having issues with a chip marked as N82S141N, which i know already is type of MASK ROM. i have a EEPROM reader, but cant find a chip type to allow me read the chips successfully.

chip for identification is here
Code
https://www.mediafire.com/view/hihf31l91zuta0p/Chip-UNreadable.jpg/file

many thx in advance,
Dam0

Joined: May 2009
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82S141 corresponds to a tri-state 512x8 4096-bit bipolar PROM. Equivalents:

NEC: uPB425
Fairchild: 93448
Fujitsu: MB7126
Intersil: IM5625
MMI: 6341-1, 63S483, 63S485
Texas Instruments: TBP28S46, SN74S474
Motorola/Harris: HM7641-5, MCM7641
Raytheon: 29625, 29627
AMD: Am27S31
National Semiconductor: DM74S474, 87S296
Intel: D3624

A number of EEPROM readers can have some trouble with older bipolar PROMs, my advice would be to use the following pinout and re-wire it to match the pinout of any larger, more well-known ROM supported by your EEPROM programmer, and use either:
- A breadboard, a socket for the "stand-in" EEPROM to plug into the reader, and a bunch of breadboard wires to jumper things over as appropriate, tying all of the higher address lines on the EEPROM together
- Two sockets, one for the "stand-in" EEPROM to plug into the reader, and one for the bipolar PROM itself, a small segment of perfboard, and do some manual re-wiring.

Code
512*8 = 4096 bit

   +--\/--+
A7 |1   24| Vcc
A6 |2   23| A8
   |3   22| NC
A4 |4   21| /CE1
A3 |5   20| /CE2
A2 |6   19| CE3
A1 |7   18| CE4
A0 |8   17| D7
D0 |9   16| D6
D1 |10  15| D5
D2 |11  14| D4
GND|12  13| D3
   +------+

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Dam0 Offline OP
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thank you, i will first try the "Equivalents" list, and see if i get lucky, ill then try the re-wire method you outline above.

thx again.
D

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If you will do more dumps for MAME...just make yourself this adapter and you will be able to dump most/nearly all possible PROM's with most likely every cheap programmer:

https://team-europe.blogspot.com/2022/06/bprom-read-adapter-v02-21in1.html

i designed this adapter exactly for this situations! PROM's are mostly only supported at very old programmers or with programmers, which cost more than 500eur. This adapter will support them with every programmer!

3 members like this: R. Belmont, Dam0, robcfg
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Dam0 Offline OP
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awesome work, thanks

ordered and on its way!

D.

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Dam0 Offline OP
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arrived and having issues - TeamE, ive send PM

also, your link for email doesnt appear to point to any legit email server thats actually online
Code
te@crazy#2001#.33mail#.com (remove all # from the address)

Last edited by Dam0; 11/26/22 01:30 AM.
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T
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i just wrote you, on your PM.


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