Sinclair ZX80 / ZX81 / Z88 Forums

i'm in for one with case. Thanks

It can be done, see "allram.pdf" from this link (it is for Harlequin 128 issue 3H but can modify for ZX +2)

https://onedrive.live.com/?id=E0ADBB58A ... 58ADB8D869

If you don't want allram mode, just only need to use zx +2 with floppy disk interface it will more easy

There is "Superfo Harlequin 128 issue 4A" PCB on SellMyRetro or eBay. It support ALLRAM mode so if you add Floppy Disk Interface like this one, it can run CP/M Plus 1.0 same as ZX Spectrum +3 or it can run CP/M 2.0 version for ZX Spectrum +3 https://onedrive.live.com/?id=E0ADBB58ADB8D869%21206782&ci...

Someone from this forum reverse engineer long time ago

please can you send me the schematic of the superfo harlequin 128 issue4 link is invalid mira Board is no longer available but ZX Nuvo can run CP/M too https://onedrive.live.com/?id=E0ADBB58ADB8D869%21210263&cid=E0ADBB58ADB8D869 https://onedrive.live.com/?id=E0ADBB58ADB8D869%21210938&cid=E0ADBB58AD...

Read this file

https://onedrive.live.com/?cid=E0ADBB58 ... 49&o=OneUp

Buy small monitor like this one, it support both PAL and NTSC

https://www.amazon.com/Hikity-1024X600- ... 720&sr=8-3

US3,4,56 are RAM

You can get document from here.

https://onedrive.live.com/?id=E0ADBB58A ... 58ADB8D869

To make it works you need to program U2, U5, U59 which require programmers.

Attached is the scan document of this interface.