Author Topic: Amstrad GX4000 / Plus cartridge PCB  (Read 5526 times)

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Offline TotO

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Re: Amstrad GX4000 / Plus cartridge PCB
« Reply #25 on: 12:19, 05 January 22 »
Hi Shining,

Please, can you show it working?
I have tested and it doesn't work for me.

Thank you.
« Last Edit: 12:22, 05 January 22 by TotO »
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Offline Bryce

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Re: Amstrad GX4000 / Plus cartridge PCB
« Reply #26 on: 14:43, 05 January 22 »
I use one of these all the time. It has always worked fine with any machine I tried it on.

Bryce.
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Offline schombi

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Re: Amstrad GX4000 / Plus cartridge PCB
« Reply #27 on: 07:53, 09 January 22 »
My skills in soldering a fairly poor and I have no background in electronics, but I successfully managed to build me a working Batman the Movie cartridge. Thanks for sharing this project!

What I´m still struggling with: I was always under the impression that the ACID chip was always required to use a cartridge on the GX4000 and those chips are hard to get these days. How come this project lets you decide whether to run with or without the ACID chip?
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Offline Bryce

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Re: Amstrad GX4000 / Plus cartridge PCB
« Reply #28 on: 13:04, 09 January 22 »
My skills in soldering a fairly poor and I have no background in electronics, but I successfully managed to build me a working Batman the Movie cartridge. Thanks for sharing this project!

What I´m still struggling with: I was always under the impression that the ACID chip was always required to use a cartridge on the GX4000 and those chips are hard to get these days. How come this project lets you decide whether to run with or without the ACID chip?

The 74HC112 is setting the appropriate signals at exactly the right time, so the CPC thinks there's a valid ACID chip on the board.

Bryce.
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Offline schombi

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Re: Amstrad GX4000 / Plus cartridge PCB
« Reply #29 on: 20:29, 09 January 22 »
Many thanks! Has this been only discovered "recently"? Seems like a pretty simple solution. I always thought a more complex workaround (e.g. a CPLD) was required.
« Last Edit: 20:32, 09 January 22 by schombi »
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Offline pelrun

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Re: Amstrad GX4000 / Plus cartridge PCB
« Reply #30 on: 04:38, 10 January 22 »
There's a flaw in the ACID design that's being exploited - the CPC signals that the input from the 'ACID' is wrong long enough before forcing a reset that you can flip the input you're supplying (via the '112) to make it happy again.
https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/acid-chip-inside/msg22291/#msg22291
« Last Edit: 04:43, 10 January 22 by pelrun »
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Offline schombi

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Re: Amstrad GX4000 / Plus cartridge PCB
« Reply #31 on: 10:33, 10 January 22 »
Cheers!  :)
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