Re: Linux Incompatibility List

Hamie
2004-08-24T21:34:49Z

Kyle Moffett wrote:

> On Aug 22, 2004, at 02:36, Jonathan Bastien-Filiatrault wrote:
>
>> My dad had a thing like that(quick reference card) for an old
>> motorola 6800(not 68000) processor. It only had 2 8-bit general
>> purpose registers if I remember correctly. Doesn't even begin to
>> compare with modern ppc processors.
>
>
> Hey! I built a primitive computer from one of those in a
> microprocessor class a year ago. 2 8-bit registers, 8-bit data-bus
> and 16-bit address bus. There were two interrupt pins, IRQ and NMI,
> and a simple condition code register. The CPU clock is the same as
> the bus clock. What fun!!!
>

Here's where I feel my age... 6502 with ONE (That's 1) general purpose
register (Called the accumulator)... Plus a couple of others used mainly
for offsets (X & Y if I remember correctly)... No 16-bit maths... All
8-bit. (As were the registers). Boy the 6809 was easy to program after
that sucker...

The 6809 (basically an extension of the original 6800) had 2x 8-bit
registers IIRC, that you could actually treat as a single 16-bit
register as well (i.e. multiply one 8bit by the seocnd & read the result
from the '16-bit' register... The assember language on the 6800 series
was way better than the 6502 (And the 6510).

but I digress... Even IBM were good with open source. I think I still
have an IBM PC tech reference around here with the complete source code
listing (In x86 assembler) of the original IBM PC Bios. Now that made
for innovation... Open hardware & software. Heck most of these companies
need a good reminder that if they hadn't had a leg up fro Open computing
in the early 80's they wouldn't be here today.

H