Sinclair ZX80 / ZX81 / Z88 Forums

mrtinb wrote: ↑Thu Aug 15, 2019 12:48 pm If you follow the instructions in the article, will you not have a binary?

What needs to be discovered by Paul?

You are right Martin but I don't want Moggy to send me a tape. So I made a p file that puts zxpand in the correct memory mode and save to SD instead of tape. Not much of a problem.
Kind regards Paul

I guess the reason for 2 EPROMs on MemoText is:

• 1/2 of the ROM space between 8-16k in one EPROM
• 1/4 of the ROM space between 8-16k in another EPROM
• then 1/4 of the ROM space between 8-16k can be either Centronics I/F or RS232 I/F

That would make sense as the printer EPROM is just 2k in size so it would like you say, use up the remaining ROM space.

The intercept of the ZX81's ROM would have to be done by the PAL then. Let's assume the PAL contains both logic for intercepting and the few bytes of data needed. Probably implemented like the "dead-ROM-bug".

According to Paul it's only function is to autostart when the module is switched on.

By the way the instructions seemed not correct in every respect.
Anyway I created the required REM and entered the copy to REM routine. This was sent to Moggy.
The result is not a binary file but a p file with Memotext binary in the REM where it's useless.
Once I receive this I will modify it so it copies the content from REM to RAM in the 8-14K area where it can be run.
This file will be posted here for further debugging of the load and save routines. Three of the 12k are free for adding commands like LAP which will do the same as LAF but on zxpand.

Quick update.

Paul kindly sent me the EPROM extraction program and after following his excellent instruction I have dumped the code and returned the file to him, hopefully I got it right time will tell!

Great international collaboration.

Agreed!

The first flag in memory of the late Fred Nachbaur.