Search found 2479 matches

by Dave
Sat Mar 28, 2020 4:14 pm
Forum: Hardware
Topic: QL Add-on ROM
Replies: 34
Views: 1654

Re: QL Add-on ROM

I have programmed flash off the QL bus, during multi-tasking, without problems. If you recall my idea a few years ago of having multiple CPUs mapped through dual port SRAM to areas of the QL's memory map, I did a fair amount of work on it. I ended up using a small flash as a persistent system-progra...
by Dave
Fri Mar 27, 2020 4:05 am
Forum: General QL Chat
Topic: Comparing Sinclair QL to Commodore 64
Replies: 29
Views: 1273

Re: Comparing Sinclair QL to Commodore 64

If I had to pick a machine that was most line the QL, I would pick the Coleco Adam. Similarities: Both have two CPUs. The Adam 2nd CPU, used for system IO and memory management, is a 6801 - a small ROM microcontroller version of the 6800. In the QL, it's an 8049. Both communicate through an internal...
by Dave
Wed Mar 25, 2020 9:04 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 259
Views: 24169

Re: Today I Received...

XorA wrote:I wonder if this could be QL related purchase?


Tease. :o
by Dave
Wed Mar 25, 2020 8:59 pm
Forum: Hardware
Topic: QL Add-on ROM
Replies: 34
Views: 1654

Re: QL Add-on ROM

I don't have any miniplanes left, sorry. I did a 128K battery backed SRAM with write protection a few years ago, for my own personal use. I'll dig it out. It sounds exactly what you need. If I can find the PCB files, I'll publish them. It used two 628512 to implement 896K, with the top 128K write pr...
by Dave
Fri Mar 20, 2020 5:22 pm
Forum: Compatibles Corner
Topic: Does ITX Cases work for any QL Compatible Motherboard
Replies: 15
Views: 1970

Re: Does ITX Cases work for any QL Compatible Motherboard

Mini-ITX cases do not work for any currently available QL or clone.

The Q68 can be bodged into anything, but "bodge" is the operative word and a mini-ITX case is still massive overkill for the Q68.
by Dave
Sun Mar 08, 2020 2:04 pm
Forum: Compatibles Corner
Topic: Q68 Serial devices
Replies: 71
Views: 3987

Re: Q68 Serial devices

It does sound like the power supply. You plug the keyboard in and it delivers the extra current, but then after a few seconds it hits the thermal limit and starts current limiting?
by Dave
Sun Mar 08, 2020 2:32 am
Forum: Compatibles Corner
Topic: Q68 Serial devices
Replies: 71
Views: 3987

Re: Q68 Serial devices

I had similar behavior to this with my Q68 very originally. It turned out to be a tin whisker on the PS/2 pin. Juuust enough to cause power glitches. It's very unlikely to ever happen twice, but it would be good to rule it out. Another possibility is that the power supply isn't quite providing enoug...
by Dave
Sat Mar 07, 2020 9:07 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 259
Views: 24169

Re: Today I Received...

But it provides a similar function and would reasonably be found by people searching for the TM'd product, so it meets the definition of "confusingly similar."
by Dave
Sat Feb 29, 2020 3:04 pm
Forum: Hardware
Topic: MDV2 Microdrive spinning slowly all the time.
Replies: 16
Views: 1399

Re: MDV2 Microdrive spinning slowly all the time.

If you physically examine the wires, you might find they're in rough shape.

Buying some turned pin socket strips, and reshaping and soldering these wires into the socket strips, to get a nice, secure connection, might help.
by Dave
Fri Feb 28, 2020 4:14 pm
Forum: Hardware
Topic: MDV re-felting
Replies: 5
Views: 624

Re: MDV re-felting

Would this be what you were talking about? https://www.ebay.com/itm/Replacement-Felt-Pressure-Pads-for-8-Track-Tape-Cartridge-Repair-Fix-16-Tapes/183943359893 That would work. Cut it to fit the full size of the metal pad - not the tension arms part. The main thing about it is it is anti-static trea...