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Author Topic: EPROM/Flash ROM/SRAM expansions (Read 28011 times)

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #90 on: 2014.February.19. 19:57:24 »
Quote from: gflorez
The bad segments are: BF-B0, 9F-90, 3F-30 and 1F-10.
These are the SRAMs on the EXDOS card. But this is summary 1024K not a 512K!

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #91 on: 2014.February.19. 22:33:33 »
You're right, what happens is that the figures run very fast and HOLD doesn't work well in that test, but the errors are in those intervals. Tomorrow I will make a more exhaustive inspection.
--------------------------------
Tienes razón, lo que pasa es que las cifras pasan muy rápido y HOLD no funciona muy bien en ese test, pero los errores están en esos intervalos. Mañana haré una inspección mas exhaustiva.
« Last Edit: 2014.February.19. 23:25:43 by gflorez »

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #92 on: 2014.February.19. 23:17:03 »
Use :LRAM command, and see what is missing from the list.

Anyway if you start the testing with STOP key then will halt at when bad segment found.

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #93 on: 2014.February.20. 13:21:02 »
Ok, with :LRAM the only missing segment is 10. But I thing is the segment in use.

STOP test doesn't find any bad segment.

A rigorous examination with the (N)ormal test shows that the failed segments are....:


 Never the same...there are no segments in that range that always fail or always been correct, they give random errors which fluctuate sometimes summing 544k and other 480k
« Last Edit: 2014.February.20. 14:28:59 by gflorez »

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #94 on: 2014.February.20. 16:33:16 »
Quote from: gflorez
Ok, with :LRAM the only missing segment is 10. But I thing is the segment in use.
Yes the lowest segment are the Page Zero segment.

Do you used the LRAM after when the test found bad segments?

Quote from: gflorez
STOP test doesn't find any bad segment.
Do you combined with others? For example with the normal?

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #95 on: 2014.February.20. 18:03:48 »
Now I realize.... you meant N test + :LRAM.



Here I leave the results:

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #96 on: 2014.February.20. 18:08:29 »
I know I made a mistake on something but I find no fault in the modifications.

Invariably it hangs after the :LRAM test.
« Last Edit: 2014.February.20. 18:11:45 by gflorez »

Offline szipucsu

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #97 on: 2014.February.20. 21:18:19 »
OFF:

Quote from: gflorez
las cifras pasan muy rápido
Can't you say "rapidamente" instead of "rapido" here? Why "rápido" and not "rapidamente"?

¿No puedes decir aqui "rapidamente" en lugar de "rápido"? ¿Porque "rápido" y no "rapidamente"?
SOUND SOURCE 3,STYLE 16,LEFT 16,RIGHT 64,SYNC 2
SOUND SOURCE 2,STYLE 128,PITCH 25.2,SYNC 2
SOUND PITCH 25,SYNC 2
Videos

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #98 on: 2014.February.20. 22:42:15 »
You are right,  "rápidamente"gives better informatión, but "rápido is perfectly correct, like saying in English "fast passing" intead of "fastly passing".
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Tienes razón, "rápidamente" da mas información, pero "rápido" es perfectamente correcto, tal como decir en Ingles "fast passing" en vez de  "fastly passing".

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #99 on: 2014.February.21. 09:34:52 »
Quote from: gflorez
Here I leave the results:
Very interesting! :shock:
Every second segment looks to be marked bad...
My first idea: verify the A14 address line which are moved from the original position on the SRAMs (replaced by WE, and A14 go to another pin)
« Last Edit: 2014.February.22. 13:45:31 by szipucsu »

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #100 on: 2014.February.21. 10:40:52 »
I've been thinking that some signal has been left connected when I taken advantage of the card tracks to do the bridges...

I'll try what you suggest, but I think at the end I'll do everything aerial.
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He estado pensando que alguna señal se ha quedado conectada cuando he aprovechado las pistas de la placa para hacer los puentes....

Voy a probar lo que me dices, pero creo que al final voy a hacerlo todo aéreo.

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #101 on: 2014.February.23. 09:19:19 »
I need a socket to continue. I`ll buy it on  Monday.
« Last Edit: 2014.February.23. 09:25:53 by gflorez »

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #102 on: 2014.March.01. 15:33:57 »
I've remade all the modifications and still the EXDOS memory access acts erratically, not the 1M DRAM. Why?.

Can be another problem not related with the last manipulations?

Prior to them my Microteam card worked fine...

Offline Zozosoft

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #103 on: 2014.March.02. 20:06:49 »
What is now the current situation?

Online gflorez

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Re: EPROM/Flash ROM/SRAM expansions
« Reply #104 on: 2014.March.03. 10:14:43 »
The same, random errors accessing those three new chips, but the  old dram of the card working perfect. I'm thinking seriously to send you it to fix...
« Last Edit: 2014.March.03. 10:19:53 by gflorez »