Clockport-Adapter for A500/A1000/A2000/CDTV

[Doobrey]

@Stedy,
 It latches the lower 8 data lines too, not 100% sure if it`s really needed though.

BTW, I was fiddling about with clockports the other day, and figured out there`s enough space within it`s 64Kb memory space to have 1024 clockports... (2^10 cos there`s 10 unused address bits within the 64Kb)

 I wonder how much discount Jens will do on 1000 silver surfers ?
OK, bandwidth would suffer a bit, but it`d be fun to make an adapter that size  :lol:

[Doobrey]

Stedy wrote:
One of the parts they used a 74F521, is tricky and expensive to get hold off. A redesign might be possible.

Farnell have them for 50p each..
74F521PC

But I know what you mean,
You could replace the 521 comparator and the NOR gates with 1 GAL/PAL chip.
 Should even be enough spare logic to decode the address space and generate 4x Spare_CS and have 4 clockports  :-)

[Doobrey]

Nice one Ian, looks cleaner than the original version.

BTW, since you`re breaking out signals from the CPU socket, how about merging in the 14Mhz CPU hack ?

[Doobrey]

It doesn`t have to stop it being a DIY kit, it just depends on the size of the parts and the skill of the person building it.
 
Using an 030 card won`t make the clockport any faster, it`ll still be limited by the 7mhz system clock, but as others have said it depends on the drivers, since most were originally written for an 020 powered A1200 ( I think the silversurfer and subway have 68000 versions for the A600 adapter).
 Wouldn`t adding a CPU card cause more problems?
If it sits in the 68k socket it`d have to have a passthrough socket for the clockport adapter to plug into (unless you stacked a couple of DIL sockets together to give clearance so the CPU card can plug into the clockport adapter).. is there enough space in an A500 to do this, or will it foul on the bottom of the keyboard?
 Or do most people interested in this have the A500 in a tower?

Anyway the 14Mhz hack was just a suggestion ,but it would probably double the cost of the adapter