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Groups > comp.os.linux.misc > #59190
| From | Rich Alderson <news@alderson.users.panix.com> |
|---|---|
| Newsgroups | comp.os.linux.advocacy, comp.os.linux.misc, alt.folklore.computers |
| Subject | Re: Can't Avoid That Shit Rust - Even On Gentoo |
| Followup-To | alt.folklore.computers |
| Date | 2024-10-06 19:59 -0400 |
| Organization | PANIX Public Access Internet and UNIX, NYC |
| Message-ID | <mdd34l84waz.fsf@panix5.panix.com> (permalink) |
| References | (2 earlier) <pan$3ac1d$92afd8da$2552f614$ebf3c267@gnu.rocks> <PL-dncdcxJXTlJ_6nZ2dnZfqnPadnZ2d@earthlink.com> <SMpMO.249150$v8v2.8876@fx18.iad> <lmeosnFmgllU1@mid.individual.net> <vdv6h5$1dc01$6@dont-email.me> |
Cross-posted to 3 groups.
Followups directed to: alt.folklore.computers
Lawrence D'Oliveiro <ldo@nz.invalid> writes:
> On 6 Oct 2024 06:26:32 GMT, rbowman wrote:
>> ... as I recall you could twiddle octal locations in the opcodes.
> Sounds PDP-11-ish. The instruction layout was such that, if an instruction
> was expressed as an integer, register numbers and addressing modes fitted
> neatly into particular octal digits.
> Not sure if that was true of the PDP-10. The later VAX went all hex, of
> course.
The PDP-10 instruction layout is
1 1 1 1 1 2 3 3
0......8 9..2 3 4..7 890123456789012345
op code AC I IX address offset
All represented in octal. The HALT instruction (a variant on the JRST) is a
good example:
HALT RESUME(17) ;RESUME is a symbolic address, let's say 654321
The assembly representation is
254 04 0 17 654321
The in-memory representation is 254217654321. Patching from the front panel of
a 166, KA-10, or KI-10 processor is simple enough, if you know where your program
lives in memory (not a given, since the entire line is intended for multiuser
usage).
--
Rich Alderson news@alderson.users.panix.com
Audendum est, et veritas investiganda; quam etiamsi non assequamur,
omnino tamen proprius, quam nunc sumus, ad eam perveniemus.
--Galen
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Re: Can't Avoid That Shit Rust - Even On Gentoo "186282@ud0s4.net" <186283@ud0s4.net> - 2024-10-05 23:51 -0400
Re: Can't Avoid That Shit Rust - Even On Gentoo Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2024-10-06 06:05 +0000
Re: Can't Avoid That Shit Rust - Even On Gentoo rbowman <bowman@montana.com> - 2024-10-06 06:26 +0000
Re: Can't Avoid That Shit Rust - Even On Gentoo Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2024-10-06 18:44 +0000
Re: Can't Avoid That Shit Rust - Even On Gentoo Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-10-06 23:29 +0000
Re: Can't Avoid That Shit Rust - Even On Gentoo Rich Alderson <news@alderson.users.panix.com> - 2024-10-06 19:59 -0400
Re: Can't Avoid That Shit Rust - Even On Gentoo David Lesher <wb8foz@panix.com> - 2024-10-07 14:42 +0000
Re: Can't Avoid That Shit Rust - Even On Gentoo Chris Ahlstrom <OFeem1987@teleworm.us> - 2024-10-07 16:24 -0400
Re: Can't Avoid That Shit Rust - Even On Gentoo "186282@ud0s4.net" <186283@ud0s4.net> - 2024-10-11 00:56 -0400
Re: Can't Avoid That Shit Rust - Even On Gentoo Chris Ahlstrom <OFeem1987@teleworm.us> - 2024-10-11 11:01 -0400
Re: Can't Avoid That Shit Rust - Even On Gentoo Peter Flass <peter_flass@yahoo.com> - 2024-10-06 15:58 -0700
Re: Can't Avoid That Shit Rust - Even On Gentoo "186282@ud0s4.net" <186283@ud0s4.net> - 2024-10-11 00:53 -0400
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