Re: Woody on 486 problem
Michelle Konzack wrote:
Am 2007-02-15 21:19:26, schrieb Mike McCarty:
Ron Johnson wrote:
So, what GUI do you use?
Eh? With MSDOS? No gooey stuff in there!
Maybe SEAL?
But there are several other DOS-Desktops including my own one
which has/had a scientific background and was coded using DJGPP.
If you want to remember when, I developed serious software
on a machine with 64 KB (yes, KILO bytes) of RAM+ROM total,
<seufz> Sinclair ZX81 => Zylog Z80/Z8000
The Zilog Z80 is an 8 bit machine, the Z8000 is a 16 bit machine.
and then Later the Zylog Z8400 (16 bit)
I created a multi-tasking RTOS running 16 apps at the same
time for a security monitoring system on that machine. The
processor was an Intel 8085.
How did you keep them from stepping on each other? You wrote the
apps in asm?
The whole shebang was assembler. I used MAC, and then RMAC when
things got too big to make a single assembly file reasonable.
I used CP/M for development, but when it was all running, of
course, it was just itself. The apps didn't step on each other,
because they didn't access memory which didn't belong to them.
How do you have coded this on a 8085?
I thought I mentioned that just above. I used MAC and RMAC+LINK
running under CP/M for development.
Was it not a 8080/8086 and they are 8 Bit
Yes, the 8085 is an 8 bit machine. It is essentially an 8080
without the extra support chips the 8080 needed. It has two
instructions the 8080 doesn't have, viz. RIM and SIM (read
interrupt mask and set interrupt mask). It supports prioritized
interrupts.
Mike
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