ROM Image Editor

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valentin
Posts: 30
Joined: Mon Nov 22, 2021 2:57 pm
Location: Faversham, UK

ROM Image Editor

Post by valentin »

Hello,

I need to write the ZX Spectrum 48K ROM into four 2732 EPROM's (Mitsubishi M5L2732K). I assume I need to find a "way" to split the 16384 bytes "48k.rom" file into four files of 4096 bytes each. What Windows / Linux / macOS program shall I use to achieve this?
Valentin
dr beep
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Re: ROM Image Editor

Post by dr beep »

Why not export a binairy block from an emulator?
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Paul
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Re: ROM Image Editor

Post by Paul »

This heavily depends on which organisation the new 4x4K ROMs will have.
Example:
Rom1: 0-4K
Rom2:4-8K
Rom3:8-12K
Rom3:12:16K
This can be achieved with a good editor like ultraedit by deleting the respective parts
Rom1:bytes 1,3,5,7,9..... of 0-8K
Rom2:bytes 2,4,6,8..... of 0-8K
This can be achieved with programming tools that come with eprommer.

And so on.
If your programmer can't do these operations,
Just contact me via PM and I will do this for you.
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
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Paul
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Location: Germanys west end

Re: ROM Image Editor

Post by Paul »

I just saw you have the same eprommer as I have TL866CS. I can guide you through its programming options to show you how to achieve what you want.
We can do a video call with screen sharing if you like.
In theory, there is no difference between theory and practice. But, in practice, there is.
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valentin
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Joined: Mon Nov 22, 2021 2:57 pm
Location: Faversham, UK

Re: ROM Image Editor

Post by valentin »

Many thanks for your feedback.

@Paul, I don't have the TL866CS; I was looking to get one, until I discovered that, with help from some adapters, I can use my Retro Chip Tester as an EPROM programmer.

I don't know yet how viable this solution is and how well it works, but I will find out soon enough (the PCB's arrived from China weeks ago and all the components are waiting to be soldered).

I am very grateful for your offer to help "quartering" the 16K ROM - I will take advantage of it ;)

The 4K EPROM's I have are organized as 4096 x 8-bit. As for the how the whole 16K will be organized... I am not sure, but I think your assumption (ROM1: 0-4K, ROM2: 4-8K, etc) is correct. Will it help to add that these four chips will be installed in ZX Spectrum Romanian clone (HC 85)? They originally shipped with 8x 2K EPROM's (2716) or PROM's (2616) - see the diagram link below; and I remember seeing boards with 4x 4K EPROM's.

ROM diagram
Valentin
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