28 Oct
2025
28 Oct
'25
12:38 p.m.
Wayne, Warner, Glenn,
Thank you very much for your responses!
Wayne,
I took a look at the PDP11GUI files and it is quite complex. I setup the
GUI on a PC here and tried it against my PDP-11/23 but wasn't able to get
it to work.
Not sure what I did wrong but I am definitely keeping it, and will go
through that source a bit later. I'm sure I'll learn a lot from it. Thank
you for the tip!
Warner,
Right now I prefer assembler because I am trying to learn more about it.
But I glanced at the BSD loader in C and find it quite interesting. I am
going to go
though that too a bit later. Thank you for this tip as well!
Glen,
I did look at the sources you mentioned and they were a bit more
bite-sized. So I have tinkered with it and am actually able to use it to
boot an 11/23 in SIMH
using that code. I have also cobbled together a little boot menu and
incorporated this loader there. Thank you for those pointers!
Thank you all!
-Peter
On Tue, Oct 28, 2025 at 6:38 AM Glen Slick via cctalk <cctalk(a)classiccmp.org>
wrote:
(DU) MSCP UDA50(RAxx) disk:
https://ak6dn.github.io/PDP-11/M9312/
https://ak6dn.github.io/PDP-11/M9312/23-767A9/23-767A9.mac
https://ak6dn.github.io/PDP-11/M9312/23-767A9/23-767A9.lst
On Mon, Oct 27, 2025, 4:48 PM Wayne S via cctalk <cctalk(a)classiccmp.org>
wrote:
Maybe look at pdp11gui ?
I think it downloads a boot loader so the code may be there.
<https://retrocmp.com/tools/pdp11gui>
PDP11GUI<https://retrocmp.com/tools/pdp11gui>
retrocmp.com<https://retrocmp.com/tools/pdp11gui>
[favicon.ico]<https://retrocmp.com/tools/pdp11gui>
Sent from my iPhone
On Oct 27, 2025, at 15:58, Peter Ekstrom via cctalk <
cctalk(a)classiccmp.org>
wrote:
I am looking for the assembler listing for a bootloader for booting from
MSCP disks like RD-disks.
Google has not been very helpful and my assembler knowledge is not enough
for me to write one from scratch. Does anyone have one they can share?
- Peter