os8diskserver help?

Kyle Owen kylevowen at gmail.com
Mon May 1 13:14:25 CDT 2017

Hi Tom,

Have you successfully confirmed the functionality of your second serial
card? Is it an M8650, M8655, or something else? If you can toggle in a
quick serial echo test to confirm it can receive characters, that'd be a
good start. Sounds like it has no trouble sending characters, which is a
good sign.

Another thing would be to confirm that the boot block did get loaded
correctly. I might also double-check that the image you're using has
already had the proper handler installed.

Best of luck,


On Sun, Apr 30, 2017 at 12:37 PM, Tom Moss via cctalk <cctalk at classiccmp.org
> wrote:

> Hi All,
> I'm in the process of building and restoring a PDP-8/e, and now I've got a
> second serial card I'd like to give OS/8 a try.
> I'm pretty sure I've got the boot loader entered properly, and the address
> + baud rates set correctly on the PDP and PC.
> When I start os8diskserver with "./os8disk -1 ../disks/diagpack2.rk05", it
> gives the welcome message. When I start the 8/e, It says:
> Booting...
> Done sending block 0
> ^ and appears to freeze there. (the 8/e doesn't halt)
> I've got a RS-232 tester (blinky light box) hooked up to the port, which
> seems to indicate that nothing is being sent after Block 0 has been sent.
> Does anyone know what's going on, or what I'm doing wrong?
> Regards,
> -Tom

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