exxos's Atari, Amiga & retro forum

stephen_usher wrote: 26 Sep 2023 11:35 Yay! (On both counts.)

Yay! indeed :D

HigashiJun wrote: 26 Sep 2023 12:28 I love receiving parcels, especially the long awaited ones...

8-)

You can't beat a good parcel :D

rubber_jonnie wrote: 26 Sep 2023 13:11 You can't beat a good parcel :D

You can throw them around rather a lot tho :lol:

exxos wrote: 26 Sep 2023 13:22

rubber_jonnie wrote: 26 Sep 2023 13:11 You can't beat a good parcel :D

You can throw them around rather a lot tho :lol:


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:dizzy:

:dizzy: :dizzy: :dizzy:

So, it seems my assertion that the lower spares board lower 16KB RAM was fine is incorrect, at least partly. I do know the RAM ICs are all good having tested them separately in a dedicated RAM tester, though, which leaves the logic.

The diagrom should first beep then test the first 16K of RAM and then the upper 32K RAM before exiting to a menu, and then looping through the RAM tests if left to it's own devices.

The spares machine just gives garbage on screen

Given the RAM ICs are all tested good, this leaves IC3 & IC4 - 74LS157 Multiplexers and the 74LS00 quad NAND gate as suspects. Luckily I have spares for both, though I'm waiting on sockets just now.

So I'll have to wait until they arrive.

stephen_usher wrote: 26 Sep 2023 10:29

rubber_jonnie wrote: 25 Sep 2023 23:04

I must have my preciouses...

Of course, "your friend" will be getting their Amstrash today won't they? ;-)

My friend is very pleased indeed:


Tell your friend thank you very much 😁

Looks good...

I'm glad that it survived ParcelFarce. :-)

stephen_usher wrote: 27 Sep 2023 23:09 I'm glad that it survived ParcelFarce. :-)

Thanks for packing it so well, and thanks again for sending it over.

Also interesting that you call it ParcelFarce as well :)