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What is the CPCX project? Is it relevant in the CPCWIKI?

Started by Ygdrazil, 14:57, 03 January 07

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Hi Guys

My knowledge of French is not the best! Browsing through some French forums i stumbled across what seems to be some sort of weird hardware project!.. What is the CPCX? Maybe a person with mere knowledge of French can write an article on subject?



It looks like a downsized version of a standard CPC464. The interesting point is that they've redone all the internal circuitry of the CPC which I think it's great because ours won't last forever.


Quick translation:

-6 channel, 8 octave (AY-3-8912 and AY-3-8910)
-Stereo soundtrack 8 bit with 4Mo memory for each channel
-Programmable sampling frequency
-discrete DAC (R/2R)
-programmagle ticker with 3 interrupts levels
-automatic ram refresh

-16kB standard CPC, 8MB for 256 video pages

-128kB CPC, 8 MB

512kB SRAM used as ROM

3 timers

Serial port

4 floppy drives
-2x 3"/360k
-2x 3"5/ 1.44MB or 720k
IDE hard drive

Parallel port

Z80 @ 10MHz

It is an add-on card for the CPC


Excellent.. I will start an article on this subject and put it under hardware extensions.

Does anybody know if its allright to use the pictures of prototypes etc.!

Does anybody know a contact e-mail address for asking permission?

Is such a CPCX card available for purchase?


For thread of CPCX look at:


The card is a prototype, but is built with simple chips and should be easy to build even with recycled items only. There are no strange part (GAL, ROM, FPGA...) and youshould only need a soldering iron and some classic electronics tools. The PCBs are double-sided and not multilayered. You will spend some time on it because there are many holes to do, however. you may or may not find irios's mail address somewhere here. i can't see the site because I don't have java installed here... You can also message him on Phenix's forum by clicking on his name in one of his posts.

About the memoory banks:
It is based on the system of the CPC, so we have 16k pages of ram. However, I don't see how overscan can be done as you can only access one "video" bank at a time... And I don't understand how the internal CRTC could access the external bank ram, too (on CPC the CRTC only access the centra ram...), so this would require an external CRTC or make the banked system only accesible to the VGA system.
In the end the system will only use the z80 and keyboard from the CPC, everything else beingdone on the external card.
The memory scheme used combines the ram expansion and rom expansion capabilities of the cpc to make various banks with each different commutable pages, I think this could break many CPC applications... so this board looks like a new computer build on the base of the CPC.


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