Search found 2769 matches
- Wed Mar 01, 2023 6:55 am
- Forum: Hardware
- Topic: My QXT640 thread
- Replies: 22
- Views: 3724
Re: My QXT640 thread
SPEM supplied a fair amount of stuff to Sandy. Most of it was decent ideas implemented fairly ok but of very very poor quality construction.
- Sun Feb 26, 2023 2:10 pm
- Forum: For Sale
- Topic: Tetroid TDI 1, Power Regulators and ROM Switchers ALL SOLD
- Replies: 12
- Views: 10478
Re: Tetroid TDI 1, Power Regulators and ROM Switchers
It’s amazing the lengths some people will go to for beer money!
- Sun Feb 26, 2023 6:51 am
- Forum: Hardware
- Topic: My QXT640 thread
- Replies: 22
- Views: 3724
Re: My QXT640 thread
Let’s add to this family picture.
- Sat Feb 25, 2023 5:22 pm
- Forum: For Sale
- Topic: Tetroid TDI 1, Power Regulators and ROM Switchers ALL SOLD
- Replies: 12
- Views: 10478
Re: Tetroid TDI 1 + 2, Gold Card, Power Regulators and ROM Switchers
Thank you kindly Sir McSir.
- Sat Feb 25, 2023 5:17 pm
- Forum: Compatibles Corner
- Topic: CST THOR 20 2F
- Replies: 9
- Views: 5631
Re: CST THOR 20 2F
The batteries start leaking because of a chemical process. When discharged, the contents expand compared to new state. Containing a paste with a liquid electrolyte, the electrolyte is the only thing that can move and is forced out. Even if you see no signs of leakage, there can still be some electro...
- Sat Feb 25, 2023 5:04 pm
- Forum: Hardware
- Topic: My QXT640 thread
- Replies: 22
- Views: 3724
Re: My QXT640 thread
Was the XTAL on this QL changed from 15 MHz? No, it's a 15 MHz, just has hot glue around it for some reason. The first few machines people got, they would look in them and ooh and ahh a lot, and touch things, and the commonest problem was people breaking the xtal. Hot glue was an elegant solution t...
- Sat Feb 25, 2023 4:47 pm
- Forum: For Sale
- Topic: Tetroid TDI 1, Power Regulators and ROM Switchers ALL SOLD
- Replies: 12
- Views: 10478
Re: Tetroid TDI 1 + 2, Gold Card, Power Regulators and ROM Switchers
I'd like the TDI2 card, please.
- Fri Feb 24, 2023 6:31 pm
- Forum: Hardware
- Topic: My QXT640 thread
- Replies: 22
- Views: 3724
Re: My QXT640 thread
They were generic cases sourced by SPEM. The cases came with the front and back panels, which were all milled by hand. They were then powder coated and had the logos applied. Some of them, a step was skipped and they shed the white like crazy. A shame, really. The keyboard interface is absolutely wo...
- Thu Feb 23, 2023 8:05 pm
- Forum: Hardware
- Topic: Sandy RAM card, PAL blew up.
- Replies: 10
- Views: 978
Re: Sandy RAM card, PAL blew up.
The PAL is a lost cause. They are plain combinatorial logic, but the logic has surely been damaged by the component falling to pieces. Also, the DRAM can no longer be trusted. As I recall, the PAL just used the CLKCPU signal and /AS and /DS to work out the CAS and RAS parts of the address bus to pas...
- Thu Feb 23, 2023 6:26 pm
- Forum: Hardware
- Topic: Sandy RAM card, PAL blew up.
- Replies: 10
- Views: 978
Re: Sandy RAM card, PAL blew up.
Hehe, well spotted. Any other expansion can fit on that connector, so you could use another 512K RAM expansion of a different brand if you like. Somewhere around here I have a vintage 512Kx8 SRAM version of the thru-con RAM card. It's not too different in logic from the internal 512K expansion. I'm ...