Re: 6502 Multitasking OS announce

[falstaff@xs4all.nl (Falstaff)]

ralph.mason@liffe.com (Ralph Mason) writes:

>You also seem to lose a register & considering you only have three I
>don't think it's that workable for use in a multitasking OS.

>The MMU and switching out the zero page and stack would seem to be the
>cleanest and best solution.  It also makes the context switch VERY
>easy.  In the interrupt handler all you do is the normal style of 6502
>interrupt code pushing all registers on the stack. swap the pages in
>the mmu, pop all the registers back ( standard 6502 int exit ) and do
>a iret - job done.

We've been discussing the problems of the 6502 in a real
environment for days.
*NOW* will you agree that the Z80 is a better 8-bit CPU?

Frank
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The famous GIICM now on line:  http://www.xs4all.nl/~falstaff/GIICM.html
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Frank A. Vorstenbosch        +31-(70)-355 5241        falstaff@xs4all.nl