Search found 948 matches

by Paul
Wed Jul 04, 2018 12:59 pm
Forum: Welcome Area
Topic: Wandering across
Replies: 5
Views: 276

Re: Wandering across

Welcome to our forums!
by Paul
Tue Jul 03, 2018 4:37 pm
Forum: SALES
Topic: eBay Listing - ZX81
Replies: 1
Views: 89

Re: eBay Listing - ZX81

Yes, you have loads of posts, so no need to worry.
by Paul
Thu Jun 28, 2018 7:24 am
Forum: Hardware
Topic: Yet another repair
Replies: 18
Views: 423

Re: Yet another repair

Yes, the ULA needs to be working to create a clock signal.
Is your Mainboard unmodified? Or could there be a short circuit some where in your Mainboard? Which ICs are socketed?
Can you please also measure your 5V supply?
In which continent are you?
Kind regards Paul
by Paul
Wed Jun 27, 2018 4:38 pm
Forum: Hardware
Topic: Yet another repair
Replies: 18
Views: 423

Re: Yet another repair

The Oscillator is 6.5 MHz and can be bought at Reichelt.de or on SellMyRetro.
The resulting Clock going to the processor is half of it, 3.25MHz.
These resonators (3 Pin) normally dont break. If its dead its normally the ULA that fails.
Kind regards
Paul
by Paul
Fri Jun 22, 2018 11:15 am
Forum: SALES
Topic: Sinclair ZX Spectrum - console + power supply
Replies: 6
Views: 231

Re: Sinclair ZX Spectrum - console + power supply

As he only posts links as adverts I have now banned him.
by Paul
Wed Jun 06, 2018 8:50 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 198
Views: 21008

Re: ZX81 ULA-in-a-CPLD

Yes, that price is more than acceptable ;)
The danger might be that at low prices the demand might be quite high.
I'd take five for example.
Andy, are you soldering them manually?
Any other plans for the coming years? :mrgreen:
by Paul
Tue Jun 05, 2018 10:05 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 198
Views: 21008

Re: ZX81 ULA-in-a-CPLD

McKlaud wrote:
Tue Jun 05, 2018 9:52 am
from the final batch.
Hopefully this will be in more than 30 years :mrgreen:
by Paul
Thu May 31, 2018 11:26 am
Forum: Software
Topic: Interrupts on ZX81
Replies: 7
Views: 700

Re: Interrupts on ZX81

Isn't the usual approach to do polling in a custom display routine?
One option is to use PowerBasic by swatosch if you want to use it easily from Basic.

Busreq will also stop the display.
by Paul
Wed May 23, 2018 8:53 pm
Forum: SALES
Topic: Future of the SALES section
Replies: 8
Views: 778

Re: Future of the SALES section

Mark, I think this is very reasonable.
I also thought about a year's membership / or a number of posts.
I also think that trying to sell here a number of weeks before posting a link to a selling site is good.
Kind regards Paul
by Paul
Wed May 23, 2018 4:14 pm
Forum: SALES
Topic: Future of the SALES section
Replies: 8
Views: 778

Re: Vintage Timex Sinclair 1000 Personal Computer

Although this sounds reasonable for new members it might disturb long time members who would like their hardware to find a good home at reasonable prices.
I will discuss possible options with my colleagues.
Kind regards Paul