Search found 448 matches

by gozzo
Thu Jun 22, 2017 3:56 pm
Forum: Software
Topic: Interesting print out
Replies: 20
Views: 3918

Re: Interesting print out

100% certain its for a spectrum , not only because of read data and restore statements, but the lower case letters and use of the poke to change character font !
by gozzo
Wed Jun 21, 2017 12:40 pm
Forum: Hardware
Topic: Simple UDG?
Replies: 7
Views: 1201

Re: Simple UDG?

aha, i worked out a possible way of doing that with wilf rigters external chr$ circuit, making it 'programmable', i never got round to building the thing to try it, if i can find the circuit (rough hand drawn) i'll scan it and post it here...
by gozzo
Sat Jun 17, 2017 9:02 pm
Forum: Hardware
Topic: Create ULA for €5?
Replies: 84
Views: 13728

Re: Create ULA for €5?

in that case maybe one or two at the most.... bit misleading title...
by gozzo
Sat Jun 17, 2017 6:05 pm
Forum: Hardware
Topic: Create ULA for €5?
Replies: 84
Views: 13728

Re: Create ULA for €5?

whoah, definitely interested in a few if they can genuinely be sold for around 5 euro/pound or whatever!!!
by gozzo
Thu Jun 08, 2017 4:45 pm
Forum: Hardware
Topic: Vertical bands on screen
Replies: 10
Views: 1454

Re: Vertical bands on screen

your machine has the earliest ula and this is lacking the 'back porch' part of the signal, so WILL give poor dark picture on a colour tv, even if its perfectly ok... it will usually be ok on a black & white set..the zxvid or zxccb will cure it by adding the back porch..dont worry too much about the ...
by gozzo
Thu Jun 08, 2017 4:43 pm
Forum: Hardware
Topic: Vertical bands on screen
Replies: 10
Views: 1454

Re: Vertical bands on screen

£28 each is far too expensive, especially as they are not fully tested and seller wont give refund if found partly duff..
by gozzo
Tue May 16, 2017 3:37 am
Forum: Hardware
Topic: ZX Spectrum Issue 3 repair
Replies: 123
Views: 18200

Re: ZX Spectrum Issue 3 repair

..that could've been why it didnt work..???
by gozzo
Tue May 16, 2017 3:36 am
Forum: Hardware
Topic: ZX Spectrum Issue 3 repair
Replies: 123
Views: 18200

Re: ZX Spectrum Issue 3 repair

supposedly a -6 'shouldnt' work in an issue 6 , only -7, due to timing change, but might have been a 'selected' one that did !! -7 's are supposed to be used in issue 4 and above, except apparently samsung issue 4s which can handle -6 's .. ?!
by gozzo
Sat May 13, 2017 1:08 am
Forum: Development
Topic: Minstrel ZX80 Clone
Replies: 12
Views: 2761

Re: Minstrel ZX80 Clone

a 6mhz cpu was probably used as it may have been more easily available than a 4mhz one.....
by gozzo
Sat May 13, 2017 1:06 am
Forum: Development
Topic: Minstrel ZX80 Clone
Replies: 12
Views: 2761

Re: Minstrel ZX80 Clone

if you do that, you wont be able to get a display as the video timings are derived from the clock, and yes, the cpu clock is half that of the resonator/crystal...you must keep it at 6.5mhz...although it IS possible to rig up a 'turbo' circuit, which runs the cpu at 6.5 mhz when running program code,...