support external RAM (megabyte)

[stefandrissen]

No description provided.

[dandoore]

With regards to #6 can this be expanded to multiple One Meg interfaces?

[stefandrissen]

Good point!

It should not be too difficult, the larger problem however will be #6, and until #6 is done, there is no point :-)

[stefandrissen]

Actually, I think it will automatically work since:

Each 1 Mb External Memory unit is divided into 64 pages of 16k each, selected by the first 6 bits of ports 128 and 129. The most significant two bits of each port select one of the four possible 1 Mb External Memory units.

And being "good" assembly code I'm not checking any boundaries, so megabyte 1 will automatically flow over to megabyte 2 :-) You will need to configure your megabytes "normally" - ie 1,2,3,4

[stefandrissen]

[stefandrissen]

released - timing needs some cleaning up, but this also applies to non-megabyte...