At 23.21 18/11/2003, you wrote: >Has anyone come across a spem internal memory expansion? > >How was this implemented in the QL? >Was it one that simply plugged into the 8301 socket - with through >connector and wired to the 68008?
I had one some years ago. This one is plugged into the 8301 socket, bat the added memory is handled by 8301 like original memory. Pins 2,3 and 10 of the ZX8301 are plugged outside the original socket disconnecting in fact A17, A16 and CAS1L; new signals A17,A16 and CAS1L are generated by PAL16L8 using also A19 and A18 by the 68008. PAL16L8 generates also a new address line for 41256 memories, CAS0L and CAS1L for two blocks of 256 Kbytes memory Apologies for my poor English. Bye.
