PDP-11 LDA BFD backend for gnu binutils

Paul Koning paulkoning at comcast.net
Sun Feb 24 12:16:31 CST 2019

> On Feb 23, 2019, at 6:16 PM, Fritz Mueller via cctalk <cctalk at classiccmp.org> wrote:
> I've been thinking it might be nice to have an LDA BFD backend for gnu binutils, so gas, ld, objdump etc. could deal with LDA's directly without having to use separate conversion utilities.
> Before jumping in on that, though, I thought I'd ask here to see if anybody might have already started or done this?  I've noticed several of the folks here also have contributions on some of the binutils lists.
>   thanks,
>     --FritzM.

What LDA do you have in mind?  Absolute loader binary, for bare metal execution?  DOS-11 binary?  :-)  Part of the issue is that there are a number of different executable forats for PDP-11 -- RSX TSK files (possibly several, if -D and -M differ which I don't know, SAV for RT-11 (and also REL), not to mention the variant wrapper RSTS uses (SIL).


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