Linked by Kroc on Thu 24th Aug 2006 20:26 UTC
OSNews, Generic OSes GEOS managed to offer nearly all the functionality of the original Mac in a 1 MHz computer with 64 Kilobytes of RAM. It wasn't an OS written to run on a generic x86 chip on a moving hardware platform. It was written using immense knowledge of the hardware and the tricks one could use to maximise speed. Note: After a small break, here is another one of the articles for the Alternative OS contest.
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Member since:

> The 68000 was fully 32-bit internally.

To nit-pick myself, that's not quite true, either. ;-)

The ISA was 32-bit, but the 68000 was mostly 16-bit internally.

Reply Parent Score: 1

The 68000...
by Kochise on Fri 25th Aug 2006 07:32 in reply to "RE[2]: Slight nit-pick for technical accuracy..."
Kochise Member since:

The 68000 have 8 *TRUE* 32 bits data registers, not extended registers like on x86. I'm an assembler coder for various CPU, and the 68000 is really a good piece of hardware !

The 68000 have a 24 bits address bus which allows addressing 16 MB flat memory (where x86 could only access 640 KB, or 1 MB if A20 used). The data bus is 16 bits, thus reading/writing a 32 bits data needs two access.

With the 68020 (the *FIRST* full 32 bits CPU ever), the address bus *AND* the data bus are spread to full 32 bits, both internaly AND externaly...

ONLY after that Intel followed with the 386 that was 32 bits as well...


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RE: The 68000...
by Sophotect on Fri 25th Aug 2006 14:38 in reply to "The 68000..."
Sophotect Member since:

The ST in Atari ST stood for Sixteen/Thirtytwo.
The later and last ones with 68030 in them where called TT. Reminds me of the 386SX somehow, but that came much later, didn't it?

Reply Parent Score: 1