On Wed, 19 Nov 2003 at 10:37:06, Romaldo Parodi wrote:
(ref: <[EMAIL PROTECTED]>)
>
>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
.. so there is no connection outside the 8301 then.
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