What is this interface?

[gozzo]

I'll see what I can do...

[gozzo]

I haven't been able to do a video of it in operation yet, but here is the circuit - I think it's correct! It decodes its EPROM into the 8192-16383 area and patches out the zx ROM at 09DB and then patches in the value of 32 onto the data bus..? Looking at a disassembly of the zx ROM, it appears to change a "LD HL,407D" to "LD HL,207D", 407D being 16509, the normal start of the program area, and 207D being 8317, within the EPROM address range. Presumably makes the zx ROM think this is now the program area..?? Will do some more tests when it is in operation. Will post a dump of the ROM and a video as soon as I can..

[BrunoFlorindo]

A YouTube video clip would be nice. I've been waiting to see it in action for the last 6 years...
A long time ago I offered 500USD* to someone if they were willing to sell it to me. They said "no thanks".

*That was a long time ago. If I had that kind of money now I wouldn't spend it on my retro interests...