14 Oct
2005
14 Oct
'05
3:37 p.m.
On 10/14/2005 at 5:11 PM Allison wrote:
While 1+ing the question we can add 8bit multitasking
for Z80 other than
MP/M to look at.
Molecular was running MT software simply by using a CPU card for each user.
That Durango system (that I'm STILL trying to give away) was designed from
the ground up with MT in mind. Since the 8085 can't do dynamic address
relocation very easily, we simply put the MT facilities in the compiled (to
a sort of P-code) BASIC. File access control and data sharing was a part
of it. Except for the very lowest level system utilities, all programs
were written in it. A 5 MHz 8085 could support 5 users quite comfortably.
Added memory was 1K pages, mapped through 64x9 bipolar RAM.
Cheers,
Chuck