Author Topic: John Morrison Demon Development Cartridge  (Read 1629 times)

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Offline IanS

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John Morrison Demon Development Cartridge
« on: 23:12, 18 October 12 »
I'd forgotten I had this. The discussion about foreground roms reminded me.
Front:

* PICT4382.JPG
(696.86 kB, 1395x1307 - viewed 86 times)

The white paint is original. The writing on the rom is mine.
Back:

* PICT4384.JPG
(559.82 kB, 1442x814 - viewed 105 times)

Any cut tracks and wires are original.

The rom is a foreground rom, which takes over the machine when you hit reset (there was a reset button attached and a case, which I will try and find).

The hardware does very simplistic rom number decoding, it repeats every 4 roms, so appears at 0,4,8 etc.
* demon.zip
(5.84 kB - downloaded 75 times)

This shows the roms at every rom position, bottom right is rom 0, "----" is the basic rom, you can see the dos rom at position 7.

Rom contents in the zip file.

I have a manual somewhere, I'll scan it when I find it.

Offline Bryce

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Re: John Morrison Demon Development Cartridge
« Reply #1 on: 23:53, 18 October 12 »
What exactly does the software on the ROM do after it has taken over the computer? I've no possibility to test it here at the moment :(

Bryce.

Offline IanS

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Re: John Morrison Demon Development Cartridge
« Reply #2 on: 00:12, 19 October 12 »
It allows you view the state of the memory, and I think save it to disk.

I remember being very disapointed when I bought it back in the 80's. I recall thinking I was getting a poor mans multiface, but I gave up on it very quickly.



Offline Bryce

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Re: John Morrison Demon Development Cartridge
« Reply #3 on: 00:29, 19 October 12 »
Well it is a very poor mans MultiFace, it doesn't save or restore the CRTC registers, address point etc :D Which requires a bit more hardware. :D

Bryce.

Offline arnoldemu

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Re: John Morrison Demon Development Cartridge
« Reply #4 on: 11:45, 19 October 12 »
It allows you view the state of the memory, and I think save it to disk.

I remember being very disapointed when I bought it back in the 80's. I recall thinking I was getting a poor mans multiface, but I gave up on it very quickly.
It reminds me of another that the French guys like to use and it's name escapes me now.
this also took control when the computer was reset......

errr... no my brain fails me.

"Le Hackeur"/"Hackit".

got it.
My games. My Games
My website with coding examples: Unofficial Amstrad WWW Resource

Online Gryzor

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Re: John Morrison Demon Development Cartridge
« Reply #5 on: 16:13, 31 October 12 »
Ohh I remember seeing ads for it... Where, I can't say, maybe in one of the few French mags I'd bought...