Search found 134 matches

by Prime
Wed Nov 02, 2011 10:49 pm
Forum: Hardware
Topic: Keyboard kits
Replies: 19
Views: 10416

Re: Keyboard kits

OK here's the ZX81 in PC keyboard.
ZX81 in PC keyboard
ZX81 in PC keyboard
PC-ZX81.JPG (205.28 KiB) Viewed 5725 times
It't basically an issue 1 motherboard with a DIY 32K addon, built into an old DELL keyboard.
Internal view of ZX-PC
Internal view of ZX-PC
P4020010-cropped-smaller.JPG (165.84 KiB) Viewed 5725 times
And that's an internal view taken before I had finished assembling.

Cheers.

Phill.
by Prime
Wed Nov 02, 2011 12:36 pm
Forum: Hardware
Topic: Keyboard kits
Replies: 19
Views: 10416

Re: Keyboard kits

When I get home I'll post a picture of the ZX81 board I built into an old DELL PC keyboard, which had individual switches, needed hacksaw, dremmel and kynar wire but works great.

Cheers.

Phill.
by Prime
Fri Oct 28, 2011 3:50 pm
Forum: SALES
Topic: New Product - ZXVid
Replies: 23
Views: 20007

Re: New Product - ZXVid

We would not want to offer an option 'P' as that leads to all sorts of issues - if the unit doesn't work, then who's fault is it? But surely you already have those issues with anything but the send the ZX81 to you to fit ? i.e. if I screw up the fitting who's fault is it if it doesn't work. I guess...
by Prime
Fri Oct 28, 2011 12:43 am
Forum: Hardware
Topic: low mb SD cards
Replies: 4
Views: 2855

Re: low mb SD cards

Yeah I just bought some 32MB MMC cards from ebay, work fine with the DragonMMC and I see no reason why they wouldn't work with ZXpand, as the MMC code is fairly simiar :)

Cheers.

Phill.
by Prime
Sun Oct 02, 2011 9:27 am
Forum: Development
Topic: Return of the pseudo-sound routine..!
Replies: 3
Views: 5218

Re: Return of the pseudo-sound routine..!

How about an implementation of the Dragon PLAY command ? It took a string of values describing the notes to be played and would play them, usefull for adding tuned to basic programs. I seem to remember that Spectrum 128 basic also implemented this, and on an AY, so perhaps some code could be um....b...
by Prime
Wed Sep 14, 2011 1:06 pm
Forum: SALES
Topic: ZX81 With Byte Back BB-1 Board on eBay
Replies: 9
Views: 9717

Re: ZX81 With Byte Back BB-1 Board on eBay

Dammit I wish I hadf someone in the US who could act as an intermediary, I want to get my hands ona TS1500 at some point, but all the ones on ebay only want to ship to the US.

Cheers.

Phill.
by Prime
Thu Sep 08, 2011 9:54 pm
Forum: Hardware
Topic: Soundboard behind ZXPAND problem SOLVED
Replies: 18
Views: 7415

Re: Soundboard behind ZXPAND problem SOLVED

Andy Rea wrote:Whooey :D :D :D :D

See told ya it would be something simple ;-)
Indeed I've lost count of the number of prototypes that I've had not work because I forgot to solder something (usually on the top of the board).

Cheers.

Phill.
by Prime
Fri Sep 02, 2011 2:32 am
Forum: Development
Topic: Hi-speed loadings for zx81
Replies: 52
Views: 63144

Re: Hi-speed loadings for zx81

what computer system of days gone by had the quickest default loading speeds anyway ? I think most of them where arounf 1200bps, ciatainly the Dragon / CoCo and the Beeb / Master / Electron. The slowcoaches of course where the ZX80/81, the Acorn Atom and the Commodore Vic 20 / 64 all of which IIRC ...
by Prime
Tue Aug 30, 2011 11:05 pm
Forum: Hardware
Topic: ZX80 dark video...
Replies: 2
Views: 2334

Re: ZX80 dark video...

Ok I've been an idiot :( Checked the brightness with one of my ZX81s and that was also wayy too dark, corrected that and now the ZX80 is the correct brightness, though I'm still getting some vertical black lines on the left side of the screen which line up with the lefthand pixel in the character, o...
by Prime
Mon Aug 29, 2011 10:24 pm
Forum: Hardware
Topic: ZX80 dark video...
Replies: 2
Views: 2334

ZX80 dark video...

Hi all,

I've just recently build up one of the ZX80 reproduction boards, which does work, however the video output is really dark, even after building Grant Searle's white level restore circuit (attached), anyone have any clue how I can rectify this ?
white.png
white level circuit
(18.16 KiB) Downloaded 1067 times
Cheers.

Phill.