Posted By
Litwr
on 2016-01-11
12:26:19
|  Re: A mathematical demo
Thanks for your evaluation. 8088 is very slow in the many ways: the JMP takes 16 cycles - it takes only 3 at 6502 (12 at z80). 8088 requires 4-6 cycles to get a byte from the memory, 6502 - only 1 (less than 4 at z80), .... So if task doesn't fit into the registers then 8088 at PC XT is only about 20% faster than 6502 @2MHz.
IBM PC AT and 80286 eliminated the speed superiority of 6502 but at 1984 only... 6502 was not upgraded since 1976... CBM II and BBC Micro were available at 1982 and might be the rivals to PC XT... It is even possible to think that a bit aggressive negative advertisement of Plus/4 was a step in the mentioned way.
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