Re: Replacement for 68008
Posted: Fri Feb 25, 2022 8:13 pm
Hi,
Have you any photographs?
Have you any photographs?
RIP Sir Clive Sinclair 1940 - 2021
https://theqlforum.com/
All in one go without a recharge is the impressive thing.Dave wrote:This is the longest thing I have ever typed on my phone!
This is actually my initial idea, with a 68HC001Dave wrote:YesDerek_Stewart wrote: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?
Hi Javier,javier2112 wrote:This is actually my initial idea, with a 68HC001Dave wrote:YesDerek_Stewart wrote: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?!
I have been following your comments carefully and I am glad to hear that a good exchange of ideas has taken place. I also want to thank that this thread can be the starting point for a project to come to fruition, especially to Dave and Nasta for their high technical level. However, there are many concepts that are beyond my knowledge and experience, so I will have to study it in depth and document myself better.
Anyway, the 68020 has been mentioned here as a replacement for the 68008. I don't think this one totally fits my idea: a cheap replacement, easy to find, with almost no need for glue logic and probably with improved performance, so I think we should focus in other mentioned CPUs, such as 68HC001, 68EC000 or 68SEC000.
Regards.
I can share my unfinished project in Eagle Cad format for you. It doesn't use internal QL CLK signal (bad choice) nor it doesn't include expansion RAM nor glue logic, but it maybe useful for you.Derek_Stewart wrote:Hi Javier,javier2112 wrote:This is actually my initial idea, with a 68HC001Dave wrote:
Yes!
I have been following your comments carefully and I am glad to hear that a good exchange of ideas has taken place. I also want to thank that this thread can be the starting point for a project to come to fruition, especially to Dave and Nasta for their high technical level. However, there are many concepts that are beyond my knowledge and experience, so I will have to study it in depth and document myself better.
Anyway, the 68020 has been mentioned here as a replacement for the 68008. I don't think this one totally fits my idea: a cheap replacement, easy to find, with almost no need for glue logic and probably with improved performance, so I think we should focus in other mentioned CPUs, such as 68HC001, 68EC000 or 68SEC000.
Regards.
I am in the process of drawing a schematic for connection of a 68SEC000 to the 68008 socket, with a possible internal expansion connector.
I guess that Dave has done all this, so it is a little personal development and education for myself, I will post updates.
The point about the Super Gold Card, I thought that is a solution, but the Super / Gold Card rely on a custom Altera Chip that is obsolete, and worse that this, the PLD code seems to only work with one type of Altera chip. So that being said, maybe a good idea to start from again and produce something that everyone understands and is well documented.
I've sent a PM.Derek_Stewart wrote:Hi,
I was going to use KiCad, but I can use any CAD package.
My main idea was to connect the new CPU at the same clock speed as the QL, and have it own uncontended ram and leave the video ram to the internal QL ram.
So hopefully the timings for the QL will be able to allow Microdrive and Network to operate correctly,