Search found 290 matches

by McKlaud
Fri Oct 23, 2020 2:09 pm
Forum: Hardware
Topic: Spectrum +3 Keyboard issues
Replies: 7
Views: 1749

Re: Spectrum +3 Keyboard issues

Have a look around 40077 chip (ULA). I would not be surprised if some of soldering joints are cracked. It might be a good idea to re-flow the chip.
by McKlaud
Thu Oct 22, 2020 10:49 pm
Forum: SALES
Topic: Lambda 8300 on eBay
Replies: 5
Views: 2988

Re: Lambda 8300 on eBay

Thanks for info, but postage limited to Germany only.
by McKlaud
Tue Sep 29, 2020 12:58 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

Hi Andy,

It is a very good idea :) I've got a silly question. All buffered lines have pull-ups. Do you want to keep them HIGH when they are nor used? In my understanding they should be LOW if they are not used/active.
by McKlaud
Mon Sep 28, 2020 7:37 am
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

I have never tried to load any WAV files, only TAPs from JAA websites. If you have TZXduino I could share a few files that works and you try with them.

Bear in mind that Jupiter ACE TZX files should be converted to ZX Spectrum timings if you would like to use a bulk standard TZXduino firmware.
by McKlaud
Sun Sep 27, 2020 6:26 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

Pin 13 of Z14 is directly connected to the data line D5 and you can see all data flowing there. Take pin 13 of Z14 out of the socket and then see what you have there during the LOAD execution. If you would like to separate LOAD signal only, the oscilloscope should be triggered by the 0xFE read pulses.
by McKlaud
Sun Sep 27, 2020 3:16 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

Do you load TZX files or WAV? Are you sure that your TZX player can generate waveform with correct Jupiter ACE timings and it could be understood by Jupiter ACE? Jupiter ACE timings are different to ZX Spectrum ones. 1kHz sounds right for "0" pulses. Pilot's frequency is approx 800Hz, a logical "1" ...
by McKlaud
Sat Sep 26, 2020 5:52 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

Hi and congratulation with your build. Regarding the loading issue, try to replace C3 (47nF) to 470nF or more and check.
by McKlaud
Mon Sep 07, 2020 1:55 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

Looks good! :)

BTW You might find my Twister (JACE -> ZX81) useful and more details are there: http://www.jupiter-ace.co.uk/hardware_twisterboard.html
by McKlaud
Sat Aug 15, 2020 7:18 am
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

HI Andy,

You can find some information about the CF card mass storage there: http://www.jupiter-ace.co.uk/hardware_ACF.html

I am not sure if the modified ROM has been ever published.
by McKlaud
Fri Aug 14, 2020 8:05 am
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 123
Views: 71086

Re: Jupiter ACE (again)

Congratulations.

From photos I can see this is not the board which I recreated. It seems to be a Russian PCB.

Good work with keyboard, and keep my fingers crossed for it.