Author Topic: 40009 ROM Replacement  (Read 1012 times)

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Offline pledg

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40009 ROM Replacement
« on: 13:40, 06 January 20 »

Hi,


Some advice required please.


I'm repairing a CPC464. (see other post).


I have a TL866II plus eeprom programmer.


I think the board I'm working on may have a damaged ROM chip, I'm getting garbled screens on start-up (see other post).


If I swap this ROM with another I have from a donor board I get no screen output at all.


I take this to mean that the existing ROM is corrupted in some way and the ROM from the donor board is totally dead.


If I read these chips with the TL866II this seems to confirm this. The donor ROM reads as blank but the other loads data into the programmer.


Is it a simple task to write the OS and Basic to a new eeprom and install?


I have downloaded the os_basic_1.01 file from another post.


Any tips appreciated!


Thanks.







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Offline Bryce

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Re: 40009 ROM Replacement
« Reply #1 on: 13:53, 06 January 20 »
Yes, but make sure the file you have is both the Firmware AND Basic (32K). There are many versions online with the two halves split.

Bryce.
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Offline Audronic

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Re: 40009 ROM Replacement
« Reply #2 on: 03:05, 07 January 20 »
Amstrad 40009- Rom Ready for Eprom


Ray
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Offline pledg

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Re: 40009 ROM Replacement
« Reply #3 on: 16:48, 07 January 20 »

Thanks for the link.


Waiting for some eeproms but as soon as they arrive I'll get going and report back.


Cheers


Paul
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Offline pledg

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Re: 40009 ROM Replacement
« Reply #4 on: 19:37, 10 January 20 »
Just to confirm this file is 464 ready and no amendments required.


Paul.
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