[Memotech] Help me to target ROMs patchs !

Discussions about Sinclair ZX80 and ZX81 Hardware
Post Reply
User avatar
XavSnap
Posts: 704
Joined: Sat May 10, 2008 4:23 pm

[Memotech] Help me to target ROMs patchs !

Post by XavSnap » Sat Sep 07, 2019 12:59 am

Hi,

I had to write a tool to target any patchs on Memotech ROMs.
Memotext, Ci/f, Si/f …

Image

The main ZX81's monitor rom will be compared with the ZX81A (EO ROM).
I haven't any Memotech card, and i try to emulate them in Vb81.

Is it possible to target them?
CompRom.jpg
CompRom.jpg (23.87 KiB) Viewed 122 times
(Vb81's ROM patchs to bypass the display, Load command…)


(A wav file is enclosed in the zip file, to load it without other dedicated cards)
Rom_Compare.zip
(412.09 KiB) Downloaded 3 times
Plugin the card, load the file and take a picture !

All the best.

User avatar
XavSnap
Posts: 704
Joined: Sat May 10, 2008 4:23 pm

Re: [Memotech] Help me to target ROMs patchs !

Post by XavSnap » Sat Sep 07, 2019 9:01 pm

Hi,

You had to move the Memotext switch on, to retrieve the ROM patchs.
On the Memotech CIF, the patchs are installed while ZX81 warming up.

Have fun.

Post Reply