Search found 110 matches

by zx80nut
Wed Nov 06, 2019 5:51 pm
Forum: Hardware
Topic: Grant's pages have a new home
Replies: 2
Views: 585

Grant's pages have a new home

Hi. [Already posted this message elsewhere, but including it here in case you didn't know] For all those who follow my ZX80 (and other pages)... I have given up with the previous web hosting - they banned me because they said I was getting too many hits and instead of throttling as they used to, the...
by zx80nut
Fri Mar 20, 2015 11:33 am
Forum: Hardware
Topic: Bad Keyboard
Replies: 6
Views: 2998

Re: Bad Keyboard

If you fancy doing a bit of hacking then you can replace the bad section of the ribbon (usually where it bends) with normal stranded ribbon cable. No worries of it ever happening again. Here's one I knocked up earlier ;) ... sideView.jpg (still works fine 4 years later) Details are here: http://sear...
by zx80nut
Fri Mar 20, 2015 11:27 am
Forum: Hardware
Topic: MCM68764 EPROMs
Replies: 5
Views: 2233

Re: MCM68764 EPROMs

...just double-check the pinout of the socket matches the EPROM :) . The ZX80 is a bit non-standard (in EPROM pinout terms) - I haven't checked the 81.
EPROM and ROM pinouts
EPROM and ROM pinouts
ROMPinouts.gif (17.11 KiB) Viewed 2172 times
Details are on my page.

Regards.

Grant
http://searle.hostei.com/grant/zx80/zx80.html
by zx80nut
Thu Mar 19, 2015 11:15 am
Forum: Development
Topic: 1k2b - 2 channel beeper routine for unexpanded ZX81
Replies: 31
Views: 5524

Re: 1k2b - 2 channel beeper routine for unexpanded ZX81

Hi. It's a pain that my pages go down occasionally (free hosting). Rest assured, they are still online and if they go down, please try again the following day. I see all are up and running at the moment. I also have a mirror up and running if needed - http://zx80.netai.net/grant/ (but please try the...
by zx80nut
Sun May 19, 2013 10:37 pm
Forum: Sinclair Misc
Topic: Whoa?! Conductive rubber? In the 80s?
Replies: 3
Views: 1519

Re: Whoa?! Conductive rubber? In the 80s?

It's just carbon paint on the rubber nodule. You can buy it on eBay, or wherever. Normally used in most remote controls, the paint wears thin after use stopping the button working (how many remote controls have you had were you really need to press the buttons hard because they no longer conduct ver...
by zx80nut
Mon Mar 18, 2013 10:22 am
Forum: Sinclair Misc
Topic: Jupiter Ace redrawn (next step from the ZX80?)
Replies: 18
Views: 4615

Re: Jupiter Ace redrawn (next step from the ZX80?)

Ah... superfo, thanks, it must be your board that I recreated the track layouts from :-)

Great scans, by the way.

If you PM me your name, I'll gladly add an acknowledgement to you on my page.

Regards.

Grant
by zx80nut
Sat Mar 16, 2013 9:12 pm
Forum: Sinclair Misc
Topic: Jupiter Ace redrawn (next step from the ZX80?)
Replies: 18
Views: 4615

Re: Jupiter Ace redrawn (next step from the ZX80?)

Hi.
Thanks for the offer, but I already have high-res scans that were sent to me some time ago that I used to do my track layouts.

Thanks anyway :)

(Also, about a week ago I added the heatsink dimensions to my page. More updates to come when I get time)

Regards.

Grant
by zx80nut
Sat Mar 16, 2013 6:34 pm
Forum: Sinclair Misc
Topic: Jupiter Ace redrawn (next step from the ZX80?)
Replies: 18
Views: 4615

Re: Jupiter Ace redrawn (next step from the ZX80?)

Yeah, just saw... too much for me, I'm afraid :( (nice find, though!)
by zx80nut
Sun Mar 10, 2013 5:28 pm
Forum: Sinclair Misc
Topic: Jupiter Ace redrawn (next step from the ZX80?)
Replies: 18
Views: 4615

Re: Jupiter Ace redrawn (next step from the ZX80?)

Ah, I also asked for more detailed photos :) The initial picture looked like they were new copies, however, the updated pics show they are genuine issue 2 PCBs. I think that given the current price, the final bid price will be a bit high (maybe too high for them to actually get used (probably just k...
by zx80nut
Sat Mar 09, 2013 10:30 pm
Forum: Sinclair Misc
Topic: Jupiter Ace redrawn (next step from the ZX80?)
Replies: 18
Views: 4615

Re: Jupiter Ace redrawn (next step from the ZX80?)

Hi. I have now uploaded the track layouts (etc.) in a PDF file - same as I did for the ZX80. Various other page updates done, including modifications needed to install 2732 EPROMS on this (and the original) board. *****UPDATE 6th NOV 2019 - NEW HOSTING AND DOMAIN - PLEASE GO TO http://searle.wales A...