Search found 255 matches

by McKlaud
Fri Nov 08, 2019 7:50 am
Forum: SALES
Topic: Bits and bobs (Jupiter ACE)
Replies: 5
Views: 265

Re: Bits and bobs (Jupiter ACE)

An update: 96K RAMpack + AY bare PCB - 1 unit left for 5.00GBP 96K RAMpack + AY DIY kit including nearly all parts except 628126 IC and the edge connector - 1 set for 12.50GBP Video output buffer PCB - 3 units for 3.00GBP each Jupier ACE's PCB with add-ons like 96KRAMpack, video buffer and Twister b...
by McKlaud
Thu Nov 07, 2019 5:30 pm
Forum: SALES
Topic: CB2 micro KIT - Build your own BASIC color microcomputer within 30 minutes.
Replies: 4
Views: 227

Re: CB2 micro KIT - Build your own BASIC color microcomputer within 30 minutes.

Impressive work! I would be interested in bare PCB if possible.
by McKlaud
Thu Nov 07, 2019 9:33 am
Forum: Hardware
Topic: Trap a sound signal on the Zx81 BUS.
Replies: 6
Views: 310

Re: Trap a sound signal on the Zx81 BUS.

it looks interesting. BUT, have you considered adding 16K RAM on it, just in case. No much software can run on 1K Zeddy. Are AY ports the same like in the ZON or are they ZX Spectrum ones?
by McKlaud
Tue Nov 05, 2019 10:24 pm
Forum: SALES
Topic: Bits and bobs (Jupiter ACE)
Replies: 5
Views: 265

Re: Bits and bobs (Jupiter ACE)

Hi David,

Replied to your PM.

Kind regards
by McKlaud
Tue Nov 05, 2019 8:38 pm
Forum: Sinclair Misc
Topic: Happy Guy Fawkes Day
Replies: 4
Views: 296

Re: Happy Guy Fawkes Day

“Remember, remember the Fifth of November, gunpowder, treason and plot”
by McKlaud
Sun Nov 03, 2019 10:52 am
Forum: SALES
Topic: Bits and bobs (Jupiter ACE)
Replies: 5
Views: 265

Re: Bits and bobs (Jupiter ACE)

Hi Mark,

Replied to your PM.

Cheers,
by McKlaud
Sun Nov 03, 2019 9:35 am
Forum: SALES
Topic: Bits and bobs (Jupiter ACE)
Replies: 5
Views: 265

Bits and bobs (Jupiter ACE)

Hi All, I am clearing my draws and boxes. Some items and leftovers from my Jupiter ACE replica projects must go. Items for sale are as follows: 96K RAMpack + AY bare PCB - 2 units for 5.00GBP each 96K RAMpack + AY DIY kit including nearly all parts except 628126 IC and the edge connector - 1 set for...
by McKlaud
Fri Nov 01, 2019 6:53 am
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 17
Views: 535

Re: RAMPACK and Hi-RES mod ?

To be honest I've made this mode with 1N4148 diodes and it works without any issues.

Regarding NAND gates logic, the circuit would be as shown below:
by McKlaud
Thu Oct 31, 2019 7:05 am
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 17
Views: 535

Re: RAMPACK and Hi-RES mod ?

In your web browser change text encoding to "ISO Latin 1" and reload the page. It should work fine.

BTW I've modified a few ram pack with Wilf's trick and they show WRX1K graphics correctly.
by McKlaud
Sat Sep 28, 2019 6:17 pm
Forum: Hardware
Topic: I started on my new ZX-81 replacement board (kit) ZX81+38
Replies: 9
Views: 1130

Re: I started on my new ZX-81 replacement board (kit)

6.5MHz crystals are available at Mouser and other good electronic retailers. Also 6.5MHz ceramic resonators are still in manufacturing and available. However I would go with a 13MHz unit or LTC1799 resonators.