Posted By
IstvanV
on 2017-10-15
10:34:46
|  Re: ep128emu is updated!
On the Enterprise, access to the last 64K of RAM is slower because it is shared with the video chip, but the rest of the memory can be used without wait states. The EP64 does not have any additional faster RAM, so the code has to run in video memory. Without clock stretching or wait states, the Z80 is maybe 2-3 times slower than the 6502 at the same clock frequency, it depends on the code, some routines can be optimized relatively better on one CPU or the other. Exorcist on EP64 is only about as fast as it would be on a 2.32 MHz Z80 in the ideal case.
The Enterprise port also needs to do more work since it runs in the equivalent of hi-res graphics mode instead of text. The NICK chip does support character modes, but they are limited by the lack of color memory (separate color for each character).
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