Search found 198 matches

by Silvester
Sat May 18, 2019 2:09 pm
Forum: Hardware
Topic: Asymmetric multiprocessing...
Replies: 19
Views: 446

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: 98
Views: 4377

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: 98
Views: 4377

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: 18
Views: 762

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: 98
Views: 4377

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: 652

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: 1894

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 ...
by Silvester
Thu Mar 14, 2019 2:03 pm
Forum: Software & Programming
Topic: ql superbomber and m-crunch ..and more things
Replies: 76
Views: 4829

Re: ql superbomber and m-crunch ..and more things

Don't forget the STOP instructions halts DSL activity and that is used by Trump Card (maybe also GC/SGC?) for DRAM refresh.
by Silvester
Fri Dec 14, 2018 1:29 pm
Forum: Hardware
Topic: Q68 speed vs 680X0
Replies: 40
Views: 3790

Re: Q68 speed vs 680X0

Q40 SMSQ/E v3.33

COPYBACK 54 seconds
WRITETHROUGH 54 seconds
SERIALIZED 169 seconds

It is normal that serialized mode (probably selected by CACHE_OFF) is extremely slow - it is more restrictive than just running without cache.


:o
by Silvester
Fri Dec 07, 2018 2:38 pm
Forum: Hardware
Topic: Hardware detectives for FrankenQL?
Replies: 22
Views: 2552

Re: Hardware detectives for FrankenQL?

Perhaps I might be wide of the mark - but didn't some 64K DRAMs only need the bottom 7 address lines to be cycled for refresh so it suited Z80 REFRESH hardware? Don't know if this carried through to 256K DRAMS... edit1: 'address' not 'data' edit2: Useful site http://www.minuszerodegrees.net/memory/r...