Search found 445 matches
- Sat Jun 25, 2022 8:44 pm
- Forum: Hardware
- Topic: CPLD replacement for ZX8301
- Replies: 230
- Views: 55741
Re: CPLD replacement for ZX8301
In the beginning I did the 8 cycle (of the 7.5Mhz clock) refresh for the non visible lines and tested the speed vs the ULA and for a simple basic program loop the time it took for the cpld was about 1' 17" vs 1' 15" for the ULA. Then I reduced the 8 to 4 cycles for the non visible lines a...
- Fri Jun 24, 2022 5:25 pm
- Forum: Hardware
- Topic: CPLD replacement for ZX8301
- Replies: 230
- Views: 55741
Re: CPLD replacement for ZX8301
What I haven't really understood: How have you read the contents of the Ula to know, what it is doing? I studied Nasta's description of the ULA. It's totally accurate and I mentioned that at my fb post. Nasta is great, respect. Thanks, I wonder if it is possible to do a few small improvements when ...
- Fri Jun 03, 2022 8:26 pm
- Forum: Hardware
- Topic: Keyboard from where
- Replies: 59
- Views: 12828
Re: Keyboard from where
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'...
- Fri Jun 03, 2022 8:25 pm
- Forum: Hardware
- Topic: Keyboard from where
- Replies: 59
- Views: 12828
Re: Keyboard from where
Deleted duplicate post
- Thu May 26, 2022 2:46 pm
- Forum: General QL Chat
- Topic: Hidden MC68010?
- Replies: 5
- Views: 2105
Re: Hidden MC68010?
I found a thread here:
https://www.cpu-world.com/forum/viewtop ... &view=next
It seems it is indeed a custom marked 68010.
https://www.cpu-world.com/forum/viewtop ... &view=next
It seems it is indeed a custom marked 68010.
- Tue May 03, 2022 11:43 am
- Forum: Hardware
- Topic: Upgrading Q40 to 68060 CPU
- Replies: 72
- Views: 11921
Re: Upgrading Q40 to 68060 CPU
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 ...
- Thu Apr 14, 2022 2:11 pm
- Forum: Software & Programming
- Topic: Dhrystone benchmark QL vs Amiga
- Replies: 24
- Views: 5297
Re: Dhrystone benchmark QL vs Amiga
Given that the test is running on a 68060, I would expect it to be heavily cached, hence not very dependant on RAM speed...
- Tue Mar 01, 2022 11:56 am
- Forum: Hardware
- Topic: Replacement for 68008
- Replies: 38
- Views: 7362
Re: Replacement for 68008
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...
- Fri Feb 25, 2022 2:17 pm
- Forum: Hardware
- Topic: Replacement for 68008
- Replies: 38
- Views: 7362
Re: Replacement for 68008
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...
- Thu Feb 24, 2022 5:36 pm
- Forum: Hardware
- Topic: Replacement for 68008
- Replies: 38
- Views: 7362
Re: Replacement for 68008
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...