Re: large NPOT rowbytes
Re: large NPOT rowbytes
- Subject: Re: large NPOT rowbytes
- From: Justin Walker <email@hidden>
- Date: Thu, 2 Dec 2004 15:01:31 -0800
On Dec 2, 2004, at 14:37, Jeff Laing wrote:
Who knows, long ago in a prehistoric age of computing,
there might have
been machines with distinct address and data registers
Thats right, make me feel old.
It's a long time ago now, but I used to program DEC-10 machines where
pointers consisted of (I think, - the details are hazy now) a 18-bit
word address plus a 6-bit byte size and a 6 bit bit-offset
Close. These systems normally used 18-bit addresses for words. There
were instructions that could use "byte pointers", which were
structured, as you say, to give (more or less) direct access to "bytes"
of any size within a 36-bit word. You got as many bytes per word as
would fit, and the rest was ignored.
It does take me back...
Ah, those were the days,
when programmers were real programmers...
... and we had to pay computer center owner tuppence a month for
permission
to come to work, and when we'd get home, our mum and dad would kill us
and
dance on our graves singing Hallelujah.
My folks never went to this extreme. They just used to beat us and
make us live in a pothole in the highway, just outside the door, with a
piece of cardboard for a roof...
Cheers,
Justin
--
/~\ The ASCII Justin C. Walker, Curmudgeon-at-Large
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