Re: top and bottom

David Weinehall (tao@acc.umu.se)
Sun, 15 Nov 1998 00:47:48 +0100 (MET)


> If you assume a machine with say, 4 registers, kinda like a
> 6502 say, but 32 bits, with about 30 instructions, how many

Ehrm, not to be picky, but the 6502/6510/8502 has only 3 "normal"
registers; x, y and a, where x & y can be used as indexregisters, and a is
the accumulator-register.

There is an s (stack-pointer) register also, but there are only 2 operands
that modify it; txs (transfer x to s) and tsx (the other way around).

But I guess this is way off topic. I'd be VERY amazed if the kernel would
be possible to port to the 65xx processor... (Maybe the 65816?! Extended
65xx syntax, with 32-bit memory mapping)

/David Weinehall, 6510 hacker

>--------------------------------------------------------------------<
> <
> *****.. Tao of TRIAD *****.. <
> ****......... ______________ ****......... <
> ****.....***... ****.....***... <
> ****......***.... David Weinehall ****......***.... <
> ******........... V Varmvattnet 63 ******........... <
> ***********...... S - 922 67 TAVELSJO ***********...... <
> ****...******.... SWEDEN ****...******.... <
> ***...*****.... ***...*****.... <
> *********.... Tel # : +46(0)90 - 604 10 *********.... <
> **..... E-mail: tao@acc.umu.se **..... <
> Home-page: http://www.acc.umu.se/~tao/ <
>--------------------------------------------------------------------<

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/