Search found 201 matches

by Silvester
Sat May 25, 2019 9:31 am
Forum: Hardware
Topic: Asymmetric multiprocessing...
Replies: 71
Views: 2756

Re: Asymmetric multiprocessing...

But that can be better done with fast SERial 68681 (one of the reasons why I'm doing it); 31250 MIDI option with opto-isolators along with full SER. You'd have to change the crystal to get the right baud rate out of the 68681, so you would need to use a separate 68681 for MIDI and for serial. If th...
by Silvester
Tue May 21, 2019 3:24 pm
Forum: Hardware
Topic: Asymmetric multiprocessing...
Replies: 71
Views: 2756

Re: Asymmetric multiprocessing...

Oh that reminds me, when I first tried the MIDI interface with a Gold card it was double stepping (as each byte of Z80 code is uploaded it should 'read' back an incrementing address number). Thinking it may be due to GC 68000 not having A0 and it was doing a word access I did a quick remedy by swapp...
by Silvester
Tue May 21, 2019 3:05 pm
Forum: Hardware
Topic: Asymmetric multiprocessing...
Replies: 71
Views: 2756

Re: Asymmetric multiprocessing...

Dave wrote: Have you worked out a schematic, or got clear photos of the MIDI board?. It sounds like it would be a very interesting thing to see. Hmm, the schematic was in http://www.dilwyn.me.uk/docs/hardware/QLperip.zip (was I wot did it). Dave wrote: MIDI has been whispered in my ear more than a ...
by Silvester
Sat May 18, 2019 2:09 pm
Forum: Hardware
Topic: Asymmetric multiprocessing...
Replies: 71
Views: 2756

Re: Asymmetric multiprocessing...

There was the humble Miracle MIDI interface where the Z80 waited for OS code to be uploaded from the ROM port: http://www.dilwyn.me.uk/docs/hardware/QLperip.zip
by Silvester
Tue May 07, 2019 11:48 am
Forum: Hardware
Topic: Issue 8 discussions...
Replies: 99
Views: 5610

Re: Issue 8 discussions...

I'm working on the PCB a little today and will be ordering some prototypes. I have 2-3 people I'd like to send a hardware complete prototype to, so.... If I have Issue 8 work, that takes priority, but if I don't I'll get that PCB updated. Couple of weeks? I've got a couple of SCN68681 (DIP40) on th...
by Silvester
Sat May 04, 2019 9:43 am
Forum: Hardware
Topic: Issue 8 discussions...
Replies: 99
Views: 5610

Re: Issue 8 discussions...

SC28L92... If a driver magically appears.... Ah, it would be some sort of sorcery to write a driver without the device/hardware :D Thanks for expressing interest, Silvester. More than interest, I would be quite happy to write the driver (since no one else has come forward). The only problem is wher...
by Silvester
Thu May 02, 2019 12:44 pm
Forum: General QL Chat
Topic: What makes the OS for QL any better, different, unique ?
Replies: 24
Views: 1432

Re: What makes the OS for QL any better, different, unique ?

Arnould wrote:Until Tony one day explained the cure... or I was ready to understand :) If interested I can also write about this.

yes please :)
by Silvester
Thu May 02, 2019 12:43 pm
Forum: Hardware
Topic: Issue 8 discussions...
Replies: 99
Views: 5610

Re: Issue 8 discussions...

As the first step in the serial driver, I forked Jan Bredenbeek's 6250 (6850) driver. My fork can be found here: https://github.com/plasticuser/QL What device are you going to use, where in I/O area is it going to be addressed? (rough schematic) What machine are you expecting to use it on - BBQL ? ...
by Silvester
Mon Mar 25, 2019 2:09 pm
Forum: Hardware
Topic: Wires!
Replies: 12
Views: 754

Re: Wires!

I draw a picture with indelible pen of the connections on the underside of the keyboard platen so I don't forget :)
by Silvester
Sat Mar 23, 2019 9:50 am
Forum: General QL Chat
Topic: Why the QL ?
Replies: 42
Views: 2355

Re: Why the QL ?

So what about the QL do you feel attracted you to buy one and is there anything unique about them you feel make it better than other systems out there from the same time period. Just curious. TJ It was the first computer I had that didn't feel like a toy. Within the first hour I knew it would be a ...