Search found 195 matches

by McKlaud
Sat Dec 15, 2018 12:07 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 47
Views: 2486

Re: Jupiter ACE (again)

Jupiter ACE memory map can be found there: http://k1.spdns.de/Vintage/Sinclair/80/ ... memory.txt

Please note that the 8K ROM is full. You can use larger EPROM chip but the address deciding is simplified and you will not gain much. The new address decoder is needed.
by McKlaud
Sat Dec 15, 2018 12:34 am
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 47
Views: 2486

Re: Jupiter ACE (again)

dessony : have a look into the Jupiter's memory map. It looks like a Swiss cheese :lol: due to a partial address decoding. Any user memory extension can sit between 0x4000h and 0xFFFF addresses. So, the easiest way to extend the user memory from 1K to 17K (+16K) is employing any 16K RAMpack for ZX8...
by McKlaud
Fri Dec 14, 2018 11:09 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 47
Views: 2486

Re: Jupiter ACE (again)

I've been thinking about re-designing the PCB completely and make Jupiter in the ZX Speccy format, using newer components like 6116 SRAM chips instead of 2114, but this is a long shot.
by McKlaud
Fri Dec 14, 2018 10:57 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 47
Views: 2486

Re: Jupiter ACE (again)

So sorry, I would not publish Gerbers or source files for the main PCB on any public website. I am not going to order another batch of these boards in near future, because I am busy with a few bits and bobs for my Jupiter. I should publish on there detailed photos how I made the keyboard useful. I h...
by McKlaud
Thu Dec 13, 2018 3:52 pm
Forum: Welcome Area
Topic: Hello from Argentina
Replies: 4
Views: 137

Re: Hello from Argentina

Hi Alex,

Good you joined us.

Kind regards
by McKlaud
Mon Dec 10, 2018 6:13 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 47
Views: 2486

Re: Jupiter ACE (again)

unxiax: I’ve got a few boards left and not planning for any new batch.
by McKlaud
Sun Dec 09, 2018 4:13 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 47
Views: 2486

Re: Jupiter ACE (again)

The keyboard overlay that I printed on a self adhesive vinyl sheet and than sticked to the 1.0mm PCB overlay. I can share the Gerber files for it and you can order a small batch of them by yourself if you wish.
by McKlaud
Sun Dec 09, 2018 2:46 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 47
Views: 2486

Re: Jupiter ACE (again)

HullZX81man: Hi, PM sent.
by McKlaud
Thu Dec 06, 2018 11:33 pm
Forum: Hardware
Topic: Reversible 16K RAM
Replies: 4
Views: 310

Re: Reversible 16K RAM

Yeap,

To be honest you need 3 wires only. A10 line is connected via L2 (link) to the new memory chip.

Image

And don't forget about 10k resistor between pins 27 & 28.

Image
by McKlaud
Sun Dec 02, 2018 8:21 am
Forum: Hardware
Topic: ZX81 resurrected
Replies: 5
Views: 274

Re: ZX81 resurrected

Good work! I like happy endings. :mrgreen: