Re^2: IBM and Apple Operating Systems (Re: dosread.c again)
Joseph H Allen
jhallen at wpi.wpi.edu
Thu Nov 9 21:45:09 AEST 1989
In article <1989Nov3.191142.4163 at world.std.com> madd at world.std.com (jim frost) writes:
>korenek at ficc.uu.net (Gary Korenek) writes:
>>In article <143 at asihub.UUCP>, jmp at asihub.UUCP (John Pantone) writes:
>>> Microsoft and IBM simply blew it when designing MSDOS and the PC...
>>3. IBM put it's tail on the line in introducing the IBM PC. No one
>> knew it would take off like a rocket. It was a huge gamble.
>The PC was at least IBM's second attempt at creating a PC. Another
>attempt was called the "IBM System/23 Datamaster". It ran only BASIC
>The machine was a flop. It was such a big flop that almost nobody I
>know has ever heard of it. IBM screwed everyone who bought one of
Wow! This is the first time I ever heard of anyone who ever heard of this
machine. Years ago I wrote a payroll program in it. The support for it was
so bad that the company eventually switched to TRS80 model IIs. This leads
me to another question::
How many people have used RM/COS on a TRS-80 Model 12 or 16? This is a really
gross COBOL operating system which ran RealWorld Accounting. The TRS-80
Model-II through 16 was an interesting machine. It started out as a Z80
system similer to Radio Shack's TRS-80 Model-Is and IIIs. They then added a
68000 to it with Model 12. Both the Z80 and 68000 had protection. The 68000
side had a register for relocating programs. It's biggest problem was that
all the I/O had to go through the Z80 so it was slow. It had 4 operating
systems:
- TRSDOS (yuck: single user flat file system)
- TRSDOS-16 (same as above but with 68000 support)
- RM/COS (multi-user, small, hierachial directory structure by having a level
number attached to each file in one main directory)
- XENIX (nice but required 3 out of the 8MB of available disk space- BTW,
I've recently seen TRS-80 Model 16s with built in hard drive
and 8" high density floppy drives on sale _by radio shack_ for
$1000)
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