Search found 337 matches
- Wed Dec 19, 2018 9:25 am
- Forum: Hardware
- Topic: Issue 4B Spectrum with dot crawl in black and white
- Replies: 13
- Views: 8171
Re: Issue 4B Spectrum with dot crawl in black and white
220nF would be sufficient. This is not an issue with the capcistance only. In this application the main factor is ability to fast charging and discharging of these caps. So, the ESR would play the main role.
- Mon Dec 17, 2018 8:46 am
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
Re: Jupiter ACE (again)
Jupiter ACE is not popular like ZX81. Please bear in mind that there was sold no more 10,000 units of Jupiter ACE in 80-ties. A few more replica PCBs in recent years do not make any difference. I would not be surprised if SirMorris said 'no'. Regarding the memory map, the partial address decoding of...
- Sat Dec 15, 2018 12:07 pm
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
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.
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.
- Sat Dec 15, 2018 12:34 am
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
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...
- Fri Dec 14, 2018 11:09 pm
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
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.
- Fri Dec 14, 2018 10:57 pm
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
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...
- Thu Dec 13, 2018 3:52 pm
- Forum: Welcome Area
- Topic: Hello from Argentina
- Replies: 5
- Views: 3105
Re: Hello from Argentina
Hi Alex,
Good you joined us.
Kind regards
Good you joined us.
Kind regards
- Mon Dec 10, 2018 6:13 pm
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
Re: Jupiter ACE (again)
unxiax: I’ve got a few boards left and not planning for any new batch.
- Sun Dec 09, 2018 4:13 pm
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
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.
- Sun Dec 09, 2018 2:46 pm
- Forum: Sinclair Misc
- Topic: Jupiter ACE (again)
- Replies: 123
- Views: 106061
Re: Jupiter ACE (again)
HullZX81man: Hi, PM sent.