Search found 817 matches

by Pr0f
Sun Jun 13, 2021 9:09 pm
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 335
Views: 103309

Re: Happy Birthday!

Happy Birthday Jan :-)
by Pr0f
Thu Jun 10, 2021 7:37 am
Forum: Hardware
Topic: QL MicroDrive electrolytic caps
Replies: 11
Views: 512

Re: QL MicroDrive electrolytic caps

I thought those transistors were associated with the motor drive circuitry - so if your motor is spinning - does that not suggest they are working?
by Pr0f
Tue Jun 01, 2021 8:15 am
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 335
Views: 103309

Re: Happy Birthday!

Happy Birthday to SinclairSociety - any new QL toys to make videos for? :geek:
by Pr0f
Fri May 28, 2021 11:21 am
Forum: Hardware
Topic: Only red!!
Replies: 4
Views: 257

Re: Only red!!

one thing you can check - if you have the UHF lead (phono to tv ariel) you can connect up a telly with that and see if all your colours are there - if so I would suspect the connector on the motherboard
by Pr0f
Fri May 28, 2021 10:19 am
Forum: Hardware
Topic: zx8301 replacement
Replies: 4
Views: 301

Re: zx8301 replacement

As the output of the ZX8301 is TTL for the video signals to the RGB socket - you could employ TTL buffers to protect the ULA outputs, and use of transorbs /fast zenners or protection devices could also be used to protect the chip.
by Pr0f
Fri May 28, 2021 10:17 am
Forum: Hardware
Topic: zx8301 replacement
Replies: 4
Views: 301

Re: zx8301 replacement

The spectrum ULA is relatively simple in comparison to the QL video ULA. Also - the ULA for the spectrum is documented very well in a book, and there are numerous CPLD/FPGA variants of it available on line. I have built the Harelequin board variant of the spectrum that only has TTL chips in it -and ...
by Pr0f
Fri May 14, 2021 8:03 am
Forum: Wanted
Topic: Replacement RAM chips for QL
Replies: 2
Views: 282

Re: Replacement RAM chips for QL

Will answer the questions I can in no particular order: Desoldering tool - I use an 80w / 24v station - it seems to be marketed by many different vendors - but is usually a cream coloured device with 3 pushbuttons on the front and a handgun shaped desoldering head. Suction is good, relatively easy t...
by Pr0f
Tue May 11, 2021 9:48 pm
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 335
Views: 103309

Re: Happy Birthday!

Yummy :-)
by Pr0f
Tue May 11, 2021 5:39 pm
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 335
Views: 103309

Re: Happy Birthday!

XorA wrote:
NormanDunbar wrote:Happy Birthday Pr0F.

Hippo Birdie Two Ewes.
Hippo Birdie Two Ewes.
Hippo Birdie Deer Ewe.
Hippo Birdie Two Ewes.

Cheers,
Norm.


Is Pr0F welsh then?


No - but I like it as a holiday destination, and lived in North Wales for a year :-)
by Pr0f
Tue May 11, 2021 4:18 pm
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 335
Views: 103309

Re: Happy Birthday!

Thank you's - I shall be having some ales and other goodies later :-)

Just had a slice of chocolate and stout cake that was delivered earlier - rather tasty :-)