Hi from Lew

[Ernest]

Thanks Ewan for giving me the confidence that the B-ETI would work on a unmodified Mainboard, I decided to drop a BETI PROM into my MB1656 Coreboard in place of the v54 D-Boot ROM and fired it up.

Bingo and operational B-ETI looks like all the extra SRAM is not causing any issues (certainly on the bit of testing I did today)

Hi Ernest.
I hadn't thought of trying the ROM in a 56K coreboard.  Good thinking.
The one I have has a MB1732 (32k rom based) coreboard in it as per the pic attached.
If I'm recalling correctly, the one my mate had was the same configuration.

I must look up the ECN you mentioned.  Thanks for that.

All the best to you.

Thanks for the picture EWAN,
I think you will find the SRAM on your MB1732 will have had a minor board alteration to place the SRAM in memory space of D800h - DFFFh just under the B-ETI ROM address. No changes need for the 56k as it already has SRAM all the way up to E000h the B-ETI start address. The !ROM SEL will also be set for address E000h.

I also was a Radio amateur back in the eighties (VK6WM) however also let my license expire as family life took over the priorities.

Ernest