Search found 218 matches

by Silvester
Mon Jan 20, 2020 1:35 pm
Forum: Hardware
Topic: QL-VGA
Replies: 33
Views: 1348

Re: QL-VGA

by Silvester
Fri Jan 17, 2020 9:47 am
Forum: Hardware
Topic: Qimi Mouse, a bit jumpy
Replies: 9
Views: 369

Re: Qimi Mouse, a bit jumpy

No, still the same! I've had similar problems. The first (sudden movement of pointer to display extremes) was due to a flakey moulded 9D connector on the lead of the mouse - the socket clasps were too weak, so the connection was unreliable. The solution was to cut it off and use soldered socket. Th...
by Silvester
Tue Jan 07, 2020 11:12 am
Forum: Hardware
Topic: Replacements for Zx8301 / Zx 8302 / IPC
Replies: 25
Views: 1345

Re: Replacements for Zx8301 / Zx 8302 / IPC

What worries me much more is the ZX8301. I'm not even sure that a PCB-based replacement for this chip would be accepted widely enough... But it is the most problematic for modern monitors and therefore the device most likely to be acceptable as replaceable even for purists? Good to hear Rich still ...
by Silvester
Mon Dec 09, 2019 12:53 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 44
Views: 2971

Re: Issue Tx boards discussions

If it wasn't for the lack of suitable mice, CTRL2 replaced with QIMI mouse would be ideal (no special mouse drivers required - built into PE and SMSQ/E). But I guess you would have sacrifice one of the ROM sockets to provide space for additional QIMI circuit directly on QL PCB.
by Silvester
Mon Dec 09, 2019 12:50 pm
Forum: Software & Programming
Topic: People's opinions on the best free software
Replies: 11
Views: 792

Re: People's opinions on the best free software

Master Spy editor (fast, multiple views/files, loads anything regardless)

So useful I sometimes wish there was an Linux version.
by Silvester
Mon Dec 09, 2019 12:49 pm
Forum: General QL Chat
Topic: Bad Apple demos
Replies: 105
Views: 8350

Re: Bad Apple demos

One of the huge advantages that I used compared to your C code is that I fetch the data through low level raw sector access, I don't go through the file system layer. Aha! My attempts failed back in 2002 when trying to implement some sort of virtual memory swap file using normal driver access. Deco...
by Silvester
Mon Dec 09, 2019 12:46 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 44
Views: 2971

Re: Issue Tx boards discussions

3. We have free place and I add the battery backup socket and parts for ZX8302 battery input. These parts are optional. You'll need to prohibit access to ZX8302 until RESET ends else the 68008 can reset the QL Clock (spurious access for 4mS after voltage reaches 5V during reset). The QIMI circuit s...
by Silvester
Mon Dec 09, 2019 12:45 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 44
Views: 2971

Re: Issue Tx boards discussions

Regarding the AY3-89x, nice would be an on Tx board implementation of a let's say AY-3-8910A similar and compatible to the QSOUND expansion card. See thread https://qlforum.co.uk/viewtopic.php?f=2&t=1587 Regarding the firmware, a later version 1.31 can be found in the Toolkits section of the SB...
by Silvester
Mon Dec 09, 2019 12:42 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 44
Views: 2971

Re: Issue Tx boards discussions

But I see different between SER1 ( J6 ) and SER2 ( J5 ) on Issue 6 board: RxD and CTS - input for SER2 but output for SER1, TxD and DTR - output for SER2 but input for SER1 ). I'm a little confused what the correct and useful pinouts for new board?. I always thought the original idea was that SER1 ...
by Silvester
Mon Dec 09, 2019 12:39 pm
Forum: Hardware
Topic: "New" SD interface
Replies: 15
Views: 1197

Re: "New" SD interface

I notice that you didn't use a trimmer capacitor with the PCF8583 crystal ? I built a Minerva Mk2 last year from discrete 74xx logic. Without a trimmer capacitor my PCF8583 clock ran very fast. With QL powered up it was 3 minutes fast per hour!, but only reducing to 20 seconds fast per hour when on ...