OK, you're right! In some countries it is illegal to re-engineer, but this cute home computer is really outdated - if it ever had a big time it had been in the early eighties.
Accidentally I got access to one of this rare machines. So I took some time to dive into its secrets. The results are a listing and a schematic in this small corner of home computer history. If you have some fun with it, I'm pleased. Because I had a lot of support by the ZX-Team, I wrote an article for the magazine. This text you'll find archived, however, it is german. Feel free to translate it!
Strange enough, a nice Spaniard named Isidro found it interesting to build an Ace himself. And even more strange, it is working! Please look below for pictures and more... A big Thank-You goes to him for reporting the "Last Bug"!
jupiter.zip Archive with listing, german text, and OrCAD schematics, 173KB.
|This is my schematic, with Isidro's corrections. (68KB)
|And this is the schematic of Isidro's selfmade Ace, he's using newer memory chips and a voltage regulator. (56KB)
|If you click the pictures, you'll get the packed PDF files. It can be zoomed to get the labels and texts readable.
A hardware change for a 60-Hz-version can be found at http://www.jupiter-ace.co.uk/hardware_60hz_ace.html.
The listing was made by disassembling and staring firmly on the code. Every now and then I ran the assembler to be sure not to make any errors, and so you can rely on it. Unfortunately I don't know of any source of a manual in the web. Just put your hands on a good book of Forth and start experimenting.
Isidro Nuñez Blanco De Arenas took my schematic, corrected it a bit and built an Ace himself. His Ace is running well, this is his photo story:
A lot of work has to be done. But apparently Isidro is well prepared!
Some hours later the main board begins to look like a home computer ;-)
Now the Hour of Truth has come! What will Isidro see when he powers
OH, WOW! IT IS WORKING!
And now Isidro's Jupiter is looking like an Ace!
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