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 How to read Toshiba TC5332204 maskroms?		  New Topic  Reply to Topic
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Ptchnk

France
6 Posts
Posted - 05/03/2020 :  09:37:24  Show Profile  Reply with Quote
I've have a QG-4X programmer and an adapter for 27C400/27C800/27C160 and 27C322 eproms.

I'm just looking for checking some Toshiba TC5332204AP maskroms.

What would i need to do it, if possible, with my programmer.

Thx.
Edited by - Ptchnk on 05/03/2020 13:29:10
Reply #1

anniel

2572 Posts
Posted - 05/03/2020 :  13:49:36  Show Profile  Reply with Quote
quote:
Originally posted by Ptchnk

I've have a QG-4X programmer and an adapter for 27C400/27C800/27C160 and 27C322 eproms.

I'm just looking for checking some Toshiba TC5332204AP maskroms.

What would i need to do it, if possible, with my programmer.

Thx.
Do you have the datasheet? Try 27c160.
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Reply #2

Ptchnk

France
6 Posts
Posted - 05/03/2020 :  22:59:50  Show Profile  Reply with Quote
I wasn't able to find the datasheet for this chip. Only thing usefull i was able to find is that (from https://wiki.neogeodev.org/index.php?title=V_ROM)

"The TC5332204 mask ROMs have a similar pinout to the 27C322 EPROMs. The only difference is that they're set to byte mode only: half of the data output pins are unused. Pin 30 (Q15) is used as the address lowest bit."

And that while the 27C322 are 16-bits mode only, the TC5332204 are used in 8-bit mode.

Maybe you are right, i can try to read them as 27C160 that are 8-bits mode compatible.

When searching online, I've have found the following way to copy the content of the rom which required some tricks for the reading and then a rebuilt of the rom. This could work for me at the end if there is not other solution but as i just want read/check the rom i would be more than happy to spare that procedure.

"
1-Connect Pin 30 (Q15) and Pin 22 (Vcc) with a test lead. Then dump as M27C322 to a file v1_vcc.bin
2-Move test lead to connect Pin 30 (Q15) and Pin 12 (GND) instead. Then dump as 27C322 to a file v1_gnd.bin
3-romwak_x64.exe /b v1_vcc.bin split1 split2
4-romwak_x64.exe /b v1_gnd.bin split3 split4
5romwak_x64.exe /m split3 split1 v1.bin
"

I'm wondering if reproducing the same procedure when using M27C160 instead of MC27C322 coud allow to spare points 3- and 4- ?
Edited by - Ptchnk on 05/03/2020 23:03:18
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Reply #3

Ptchnk

France
6 Posts
Posted - 05/24/2023 :  06:52:11  Show Profile  Reply with Quote
Thought i've already posted it but apparently not.

I've built my own 16bit adaptor for DIP40/42 eproms based on the open source scheme found here:
http://www.mcumall.com/download/WillemProg/16BitEPROM_sch.pdf

The idea was to add a few options (jumpers) for reading Toshiba TC533204AP (32Mo, 8bit) and TC5364205AP (64Mo, 16bit) maskroms to make it easier to repair old video games.

Here is the link to get the files and infos about the customized adaptors.

https://oshwlab.com/ptchnk/neo-doctor-v2-0-for-gq-4x
Edited by - Ptchnk on 05/24/2023 06:55:06
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