The Sinclair QL Forum

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...

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 ...

Unfortunately, this is a bit out of warranty. :D The card is simply a thru-con RAM card with the DIN connectors not fitted. I didn't assemble/test that specific SQB board as mine only had pins fitted where signals were used. Sorry, I don't have the PAL equations. I wish I did - they would solve a lo...

I think you finely demonstrated my point.

Anyhow, I look for ward to more alternatives to the really outdated CP2200 chip. Alternatives that reduce the burden on programmers and users but most of all on the system.

And that’s why there are three solutions for the QL. Some people want the stack run for them and a driver. Some people want a TCP stack hidden behind a Hayes interface. Others want a manually operated, TCP stack in the QL, hardware to wiggle the bits and do everything manually. I think only one of t...

The sockets were so cheap and tarnished Sinclair was probably paid to use them.

Almost as bad as the CPU socket.

If you just use plain sockets and put the resistor in a jack, it works. Much cheaper than sourcing the switched jacks. This was in answer to Derek’s add-on, not the original design. Not that the termination was ever any good anyway.

A 3.5mm jack with a termination resistor solves this quite neatly.

All future designs of floppy interfaces for the QL should have a bit flip jumper that just puts the drive select line through an inverter.

QL<->PC

Problem solved.

*writes in little black book*

o/` My floppy don't jiggle jiggle
o/` It thunks
o/' My data don't wiggle wiggle
o/' It 'bad or changed medium'