Sinclair ZX80 / ZX81 / Z88 Forums

I have Watford SPDOS Disk Interface which requires system disk. Unfortunately, I do not have it . I have created 27C64 -> 27C16 interface and fried KDOS on 27C64 hoping that support logic is the same, but it does not work. If I could get the Kempston schematic I would be able to compare them and eventually do some modification(s) on Watford to make it work.

Yes, it would be easier to just insert SPDOS system disk, but I cannot find it.

Hi
I may have something that can help you or you can start with. I am struggling with basically the same with SPDOS. Are there anyway that I can contact you via voice, eg. Microsoft Teams, WhatsApp, etc as There is quite a lot to discuss with what I found in the last 6 months and will be extremely challenging in a forum context. If we get it sorted out, we can post a complete solution on the forum.
Regards
Pierre