Search found 448 matches

by gozzo
Sat Mar 10, 2018 4:23 pm
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 198
Views: 23384

Re: ZX81 ULA-in-a-CPLD

whoah!!!!๐Ÿ˜Š๐Ÿ˜Š๐Ÿ˜Š๐Ÿ˜Š๐Ÿ˜Š๐Ÿ˜Š๐Ÿ˜Š
by gozzo
Sat Feb 03, 2018 3:50 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 1152

Re: UK700 PSU running at 18.1 volts

or double up on the bridge diodes, use 2 in series for each quarter?...
by gozzo
Sat Feb 03, 2018 3:49 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 1152

Re: UK700 PSU running at 18.1 volts

you could fit a couple of 1n5401s between the output of the bridge rectifier arrangement and the cap..? that'd drop the output a bit...
by gozzo
Sat Feb 03, 2018 3:40 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 7435

Re: zx spectrum in zx81 case

can anyone supply preprogrammed cplds for this zxmax, as i have bought an empty board, can find the other parts easily,.. i do have 3 'used' cplds but as to whether they can be erased and reused i dont know, plus i dont know what software or programmer device would be needed to program them...
by gozzo
Mon Oct 23, 2017 7:26 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 1152

Re: UK700 PSU running at 18.1 volts

and ..what mains voltage is it rated for and what is it running on. if its designed for 220v (but that would normally be a EU700? or something like that?) and being run on 240v , it will be high....maybe has a 220v transformer fitted in a uk/240v case???
by gozzo
Mon Oct 23, 2017 7:24 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 1152

Re: UK700 PSU running at 18.1 volts

hmm, may have shorted turns on the primary winding, does it get warm/hot after a while when on no load? if so it could have. also test voltage with a reasonable load...
by gozzo
Fri Oct 13, 2017 4:09 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 124
Views: 8768

Re: ZX81 rebuild

these will almost certainly be genuine, very good supplier.. http://www.ebay.co.uk/itm/MPS2369A-MOTO ... 0653829622 the type number 'print' is totally different, seems to be 'etched' ...
by gozzo
Fri Oct 13, 2017 4:04 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 124
Views: 8768

Re: ZX81 rebuild

and i think that supplier above is where i got some mps2369s from..havent tried them yet..something about the type number printing doesnt look quite right, though..... maybe something else relabelled?!!
by gozzo
Fri Oct 13, 2017 4:00 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 124
Views: 8768

Re: ZX81 rebuild

oh, what were these eeproms that were bad? and from what supplier? i've bought a fair few but not got round to using them yet...
by gozzo
Fri Oct 13, 2017 3:58 am
Forum: Hardware
Topic: What is the going price to have EPROMs burnt?
Replies: 28
Views: 1826

Re: What is the going price to have EPROMs burnt?

are you thinking of offering an eprom burning service, or are you after someone to burn some for you?