21 Mar
2017
21 Mar
'17
9:33 p.m.
On Mar 21, 2017, at 10:49 PM, W2HX via cctalk
<cctalk at classiccmp.org> wrote:
Hi folks,
I have a PDP-8/e that I've been working on. I have completed construction of
AK6DN's RX01/02 emulator. I got to the step tonight where I was trying to boot an OS/8
disk image and nothing was happening. I realized that I do not have the bootstrap diode
board in my 8/e so begin the bootstrap triggered by the "SW" switch.
Does anyone have the program I can toggle in for the bootloader? What I found is somewhat
confusing. Here is a discussion on this topic.
https://groups.google.com/forum/#!searchin/alt.sys.pdp8/RX01$20boot|sort:re…
It seems one fellow was attempting to edit/improve the bootloader of another fellow. I
was wondering if anyone has distilled this into something simple. At the moment, I care
only about booting from RX01-Disk0.
Any pointers greatly appreciated. Thanks
Eugene W2HX
The Data Systems Design DSD 440 Disk Drive Manual on page 5-34 has a PDP8 RX01
drive 0 Bootstrap. I can?t vouch for it personally.
The listing basically consists of
? Load the following bootstrap sequence through the front panel.,
33/ 6755
34/ 5054
35/ 5045
45/ 7326
46/ 6751
47/ 4053
50/ 3002
51/ 2050
52/ 5047
53/ 6753
54/ 6753
55/ 5033
56/ 6752
57/ 5453
60/ 7004
? Start at location 33. IF the diskette is write-protected, the computer will halt at
location 7604. Pressing the CONTINUE (or run) switch on the front panel will then start
the monitor. Additionally, if at any time the is halted and you wish to restart in the
monitor, this can be done by the diagnostic diskette in drive 0 and restarting at location
7605.
Note: The halt/restart locations applies to a vendor supplied diagnostic.
Good luck,
Jerry WB9MRI