Search found 153 matches

by ones' complement
Wed May 29, 2024 11:45 am
Forum: Hardware
Topic: Memory IC's for PCML Q+?
Replies: 9
Views: 102

Re: Memory IC's for PCML Q+?

Just normal 41256 drams (256kx1)

https://www.aliexpress.com/item/1005003452043347.html?

Feedback is positive, £6.22 for 10 (VAT+p/p included).
by ones' complement
Wed May 29, 2024 11:10 am
Forum: Hardware
Topic: Memory IC's for PCML Q+?
Replies: 9
Views: 102

Re: Memory IC's for PCML Q+?

see https://www.qlforum.co.uk/viewtopic.php?t=4453

If your PAL is the RAM version it could do with being copied, over the years a few people have wanted this for 0K boards.
by ones' complement
Sun May 26, 2024 1:31 pm
Forum: Software & Programming
Topic: Sinclair QL + QSound demo
Replies: 10
Views: 523

Re: Sinclair QL + QSound demo

Thank you, I can make sense out of that unwrapped version :)

(The only emulator I use is SMSQmulator)
by ones' complement
Sun May 26, 2024 1:07 pm
Forum: Software & Programming
Topic: Sinclair QL + QSound demo
Replies: 10
Views: 523

Re: Sinclair QL + QSound demo

"It requires Stock QL"

OK, I'll bite. WTF is a ql68k.mdv file? 170.8kb :? :? :?

I've used a QL since it they first came out, never known such a file - it ain't stock AFAIK. Or is it meant for an emulator ? How would such be transferred and used on a real QL?
by ones' complement
Thu May 23, 2024 9:18 pm
Forum: General QL Chat
Topic: Stephen Hawking letter to Clive Sinclair
Replies: 6
Views: 373

Re: Stephen Hawking letter to Clive Sinclair

Don't recall seeing link to this: Interesting perspective from engineer who worked at Sinclair (web archive appears to have retained more of the images).
by ones' complement
Thu May 23, 2024 2:22 pm
Forum: The Off-Topic Section
Topic: Z88 power supply
Replies: 15
Views: 676

Re: Z88 power supply

Measured my Z88 PSU. Off load was 6.34V, with 27ohm resistor load 6.25V at 210mA. Z88 load (+128K rampack) was never more than 100mA.
offload.jpg
onload.jpg
current.jpg
z88load.jpg
by ones' complement
Thu May 23, 2024 12:43 pm
Forum: Hardware
Topic: Faulty (video) ram
Replies: 25
Views: 672

Re: Faulty (video) ram

Looking at the display it appears that (other than green/magenta stripes) the random pixels are placed exactly where Minerva normally shows fault report. So Minerva is trying to report a RAM failure. But surely only one 4164 fails at a time? This looks like something more than a single chip failure....
by ones' complement
Thu May 16, 2024 1:11 pm
Forum: The Off-Topic Section
Topic: Z88 power supply
Replies: 15
Views: 676

Re: Z88 power supply

Just had a quick look on eBay for Z88s and accessories, feeling a little nostalgic after getting rid of my Z88 some years ago. Like many retro systems, the prices they go for somewhat amazed me! I occasionally look at Z88 on Ebay and it does appear fickle, some long standing listings are pricey but...
by ones' complement
Wed May 15, 2024 3:27 pm
Forum: The Off-Topic Section
Topic: Z88 power supply
Replies: 15
Views: 676

Re: Z88 power supply

Z88psu.jpg
Ideally you want one with an LED. I added one to mine since it was too easy to be unaware you were running on batteries and the mains switch wasn't on :?
by ones' complement
Mon May 13, 2024 12:19 pm
Forum: Hardware
Topic: CST Ram Plus eproms - CST QDisc v4 issue
Replies: 20
Views: 1287

Re: CST Ram Plus eproms - CST QDisc v4 issue

If this byte sequence is used only for 16KB bin files for the Rom slot what about the 32KB rom files? The byte sequence $4AFB0001 can be used for any size ROM files (within available space), not just 16K. AFAIK that sequence was chosen because it was least likely to occur in normal binary files. An...