Search found 2758 matches

by Dave
Mon Apr 25, 2022 5:41 pm
Forum: For Sale
Topic: FS: A collection of QL books
Replies: 19
Views: 8050

Re: FS: A collection of QL books

I offered to buy them but nothing came of it. My offer stands.
by Dave
Sun Apr 24, 2022 7:31 pm
Forum: Hardware
Topic: HELP again- GOLD CARD
Replies: 26
Views: 4830

Re: HELP again- GOLD CARD

Is that a smear of thermal paste on the CPU? Some thermal paste is also electrically conductive and it may be making a very slight short between pins? But also, SIP RAM is the likeliest cause as others have said.
by Dave
Sun Apr 24, 2022 7:25 pm
Forum: Hardware
Topic: Use note on Tetroid buffered backplane...
Replies: 12
Views: 2458

Re: Use note on Tetroid buffered backplane...

Tetroid's already done that - just needs to pay the little extra to make it a 4-layer board. 98% of the effort is just in reproducing what he's already done. If I were going to invest that amount of effort I'd just finish Issue 8. :P
by Dave
Sat Apr 23, 2022 5:38 pm
Forum: Hardware
Topic: Use note on Tetroid buffered backplane...
Replies: 12
Views: 2458

Re: Use note on Tetroid buffered backplane...

RC networks are fine if they're tuned to the characteristics of the circuit and the frequency of the rise time. The problem with the QL is that interfaces span enough period that the range of rise times/frequencies is quite broad, so you just have to target the center frequency. When I say, "fr...
by Dave
Sat Apr 23, 2022 4:23 pm
Forum: Hardware
Topic: Use note on Tetroid buffered backplane...
Replies: 12
Views: 2458

Re: Use note on Tetroid buffered backplane...

Looks like questions were asked and eloquently answered. :D There's no need for termination on the backplane if a card occupies the last expansion slot. If a backplane were to have termination, it can become quite a complex issue. Passive termination usually involves a resistor to ground, but that r...
by Dave
Fri Apr 22, 2022 10:53 pm
Forum: Hardware
Topic: Use note on Tetroid buffered backplane...
Replies: 12
Views: 2458

Use note on Tetroid buffered backplane...

I use the quite nice Tetroid backplane in my set-up, especially as I am regularly adding and removing cards. I was testing a floppy interface and it failed after a few hours of use. It was the only card. The two failed 74-family logic ICs were replaced but it failed again shortly after, the same way...
by Dave
Mon Apr 18, 2022 4:27 pm
Forum: Software & Programming
Topic: are there music trackers for ql, and how sound works?
Replies: 23
Views: 5211

Re: are there music trackers for ql, and how sound works?

What about using the AY-3-8910 or YM2149?
by Dave
Wed Apr 13, 2022 5:47 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 642
Views: 285635

Re: Today I Received...

Congratulations. :D
by Dave
Tue Apr 12, 2022 11:45 pm
Forum: General QL Chat
Topic: Andy Pennell's books.
Replies: 96
Views: 20792

Re: Andy Pennell's books.

As a mac user, I'm quite intrigued by the notion of making a new impression of the book, with Andy's input, updates and corrections.
by Dave
Tue Apr 12, 2022 5:17 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 642
Views: 285635

Re: Today I Received...

I am sat here waiting impatiently for today's delivery. I'll post pics when it comes. LOTS of components.