Print Page - 40009 ROM Replacement

Title: 40009 ROM Replacement
Post by: pledg on 12:40, 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.

Title: Re: 40009 ROM Replacement
Post by: Bryce on 12:53, 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.

Title: Re: 40009 ROM Replacement
Post by: Audronic on 02:05, 07 January 20

Amstrad 40009- Rom Ready for Eprom

Ray

Title: Re: 40009 ROM Replacement
Post by: pledg on 15:48, 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

Title: Re: 40009 ROM Replacement
Post by: pledg on 18:37, 10 January 20

Just to confirm this file is 464 ready and no amendments required.

Paul.

CPCWiki forum

General Category => Technical Support - General => Topic started by: pledg on 12:40, 06 January 20