Search found 765 matches

by Dave
11 Feb 2020 00:48
Forum: OFF TOPIC
Topic: PCBs for Spectrum Clones
Replies: 17
Views: 791

Re: PCBs for Spectrum Clones

Martin A wrote:
11 Feb 2020 00:03
So, is anyone else ready to take up the challenge ?
Almost :-)

It’s on somewhat lengthy “to-do” list!
by Dave
02 Feb 2020 20:13
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 5638

Re: Another Home-Brew - Z180

Bill,

I can send you a known working 7128S if you like, that would eliminate a locked out jtag port problem

Regards
Dave
by Dave
02 Feb 2020 15:30
Forum: OFF TOPIC
Topic: Another Home-Brew - Z180
Replies: 53
Views: 5638

Re: Another Home-Brew - Z180

Bill,

are you sure of the CPLDs? Some of the ones that I got from Lez had the JTAG ports locked out, if that is the problem, there is no way to reset them without an Altera Master Programmer - which are unobtanium these days.

If you are using Quartus, what is the error code/message?

regards
Dave
by Dave
01 Feb 2020 13:22
Forum: OFF TOPIC
Topic: PCBs for Spectrum Clones
Replies: 17
Views: 791

Re: PCBs for Spectrum Clones

AD724JR SOP-16, £1.44 from China in singles, less for 5 or 10 pieces

regards
Dave
by Dave
16 Jan 2020 12:51
Forum: SOFTWARE
Topic: Possibly hundreds (?) of new games for the MTX
Replies: 27
Views: 1523

Re: Possibly hundreds (?) of new games for the MTX

Well, not everyone :D
by Dave
09 Jan 2020 14:13
Forum: HARDWARE
Topic: Memotech MTX ROM & EPROM pin-outs
Replies: 7
Views: 2287

Re: Memotech MTX ROM & EPROM pin-outs

Hi Pedro,

those EPROMs sould be OK - this page might help . ..

http://primrosebank.net/computers/mtx/c ... s/roms.htm

(Check the pinning of the links)

I'll try an dig out a copy of the ROMs later, or you could use a Test ROM

regards
Dave
by Dave
31 Dec 2019 17:50
Forum: SOFTWARE
Topic: Maxima, as WAV
Replies: 3
Views: 280

Re: Maxima, as WAV

Hi Lars,

thanks for that - I have posted a copy here:

http://primrosebank.net/computers/mtx/m ... _files.htm

regards
Dave
by Dave
15 Dec 2019 20:37
Forum: SOFTWARE
Topic: Possibly hundreds (?) of new games for the MTX
Replies: 27
Views: 1523

Re: Possibly hundreds (?) of new games for the MTX

Hi Bill, I agree with Martin, it's always nice to get extra "Memotech" software and I am likely to have a little play with it, but does it justify your efforts ? - probably not. Still, on these long, cold, winter nights, you'll need something to keep you busy :-) Hitch-hikers guide is available for ...
by Dave
01 Dec 2019 10:57
Forum: TRADING AND COLLECTING
Topic: For Sale / Trade : Memotech MTX 512 plus extras
Replies: 3
Views: 285

Re: For Sale / Trade : Memotech MTX 512 plus extras

If you need help, please post a photo of the “artefacs”, a corrupted display is almost certainly due to one or more faulty Video RAMs, See here : http://www.primrosebank.net/computers/mtx/repairs/vram/mtx_vram_repair.htm Or here : http://www.primrosebank.net/computers/mtx/repairs/mtx512s2/video_faul...