On Tue, 28 Apr 1998 email@example.com wrote: > As we all (should) know, the C128 is equiped with an Z80 as well. I cannot > remember we ever discussed this CPU in one of our mails. Have there ever been > nice ideas regarding this processor? Yeah, make it accelerate at 9.81 m/s², or try how high it jumps when given 220 volts. :-) In the C128 the Z80 is quite crippled, since it runs at an effective speed of approximately 2 MHz, which is like crawling. The C128 is booted by the Z80, which quickly switches over to the 8502. One thing that is worth investigating is writing a program that runs simultaneously on both processors. The C128 Programmer's Reference Guide says that it is illegal, undefined, forbidden or whatever to enable CP/M mode and C64 mode simultaneously. When I tested what happens if you do so, it seemed that both processors were active on the bus simultaneously. Writing a program that would run on both chips is quite difficult, since the addresses from the processors will be ANDed together all the time. I would give it a try if I had a detailed description of the Z80. > I do remember a writing saying you can attach another 128 KB of memory > to the expansion slot. If this is true, does anybody know some details? I think that this only refers to the C= 1700 RAM Expansion Unit, the same thing that you can plug to a C64. BTW, has anyone tried to connect the REU to a VIC-20? Marko
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