The Sinclair QL Forum

Slightly OT: Not sure who has been banned or why. Only 3 people have been banned. The most recent, on the weekend that Sir Clive passed away, was the user formerly known as "Brane_2" who was a bit of a hardware type. Apparently his hardware skills were/are lacking. (Not my observation, I'...

Deleted duplicate post

I found a thread here:
https://www.cpu-world.com/forum/viewtop ... &view=next
It seems it is indeed a custom marked 68010.

What kind of QLiberator issues are there? Problems with MMU? I had never problems of that kind with an hyperCache 030 on the Atari. I had a look at SMSQ/E docs but couldn't find any reference to it (it is a config item). Look into it later (probably much). It probably sets up the MMU to repeat the ...

Given that the test is running on a 68060, I would expect it to be heavily cached, hence not very dependant on RAM speed...

One thing which has not been mentioned is that running a faster CPU with it's private faster RAM and possibly other faster bus attached devices, requires a set of buffers/latches between the CPU bus and the QL bus. The faster signals the faster clocked CPU generates while accessing faster RAM etc sh...

Hi, Could the 68SEC000 be connected to the QL 68008 socket with an appropriate DIP to QFP adapter board, with the possibility of using it own un-contended ram? It is directly compatible when powered with 5V and the 8-bit bus width is selected. Some extra wiring is required (wiring together interrup...

If the cache is not enabled (and by default it's not), interrupt stack, stack frames and privileged instruction emulation have to be added for the 020 to behave like a 000/008. There are, however, several CPUs that can work like a 68008: 1) 68EC001 2) 68SEC000 3) 683xx (not all members) The latter a...

It is possible to run a faster 68008 variant on the QL as long as it is made to look exactly as the original 68008 at 7.5MHz. To make a long story short, the signals that need to be passed through extra logic are /DS and /DTACK. The 68008 uses both clock edges to generate various signals, If it is r...

If the original ULA chipset is used, and the CPU is operated at higher speed, there has to be extra circuitry that will fairly faithfully emulate the original 68008 running at 7.5MHz. This is because the 8301 ULA makes certain assumptions about the signal timing on the 68008 in relation to the clock...