PDP-8.co.uk » PDP-8/L

PDP-8/L Documentation

Toby Russell — Thu, 13 May 2010 21:51:41 +0000

DEC-8L-D0BA-D_KP8L_Power_Failure_Option_Functional_Description_Apr69.pdf	24-Aug-2007 19:21	204K
DEC-8L-D4BA-D_MC8-L_FuncDescr_Jun70.pdf	22-Feb-2008 03:05	1.1M
DEC-8L-D4BA-D_MC8L_Memory_Extension_Control_Option_Functional_Description_Apr69.pdf	24-Aug-2007 19:22	2.0M
DEC-8L-HR1B-D_8LmaintVol1.pdf	17-Oct-2003 04:33	5.0M
DEC-8L-HR2A-D_8Lschem_Feb70.pdf	17-Oct-2003 04:32	2.7M
DEC-8L-I1AA-D_MC8-L_Inst_Mar70.pdf	22-Feb-2008 03:05	271K

PDP-8/L: Card Locations

Toby Russell — Thu, 13 May 2010 15:57:22 +0000

This table details locations of cards on a PDP-8/L backplane. I’ve put it together to aid in working out what is missing from my 8/L. I believe it to be accurate but you are encouraged to double check!

SLOT	A	B	C	D
1	G921 – PDP-8/L control panel
2	M220		M113	M111
3	M220		M700
4	M220		M216	M115
5	M220		M113	M310
6	M220		M216	M310
7	M220		M111	M310
8	M617	M617	M216	M310
9	M617	M617	M115	M160
10	M160	M160	M119	M216
11	M115	M216	M117	M113
12	M160	M111	M115	M113
13	M160	M113	M117	M111
14	M115	M119	M113	M310
15	M162	M119	M113	M310
16	M162	M162	M111	M216
17	G020	M162	M360	M617
18	G020	G020	G221	G221
19	G020	G020	G221	G221
20	G020	G020	G610
21	W825		Memory Stack
22	W825		G611
23	G228	G228	G221	G221
24	G228	G228	G221	G221
25	G624	G624	G220	G220
26	G624	G624	M002
27	G826		M623	M623
28	G785		M115	M623
29	M715		M660	M906
30	M795		M660	M906
31	M718		M707
32	M516	M986 (?)	M706	-
33	M516	M986 (?)	M452	M076 cable
34	M111	M983 (?)	M901 cable	M903 cable
35	M111	M983 (?)	M903 cable	M908 (?) cable
36	M783	M983 (?)	M903 cable	M903 cable

Key:

Optional data break interface
Optional memory parity
Optional power fail
Optional high speed reader and/or punch

New Haul: PDP-8/L and PDP-8/E

Toby Russell — Sat, 18 Jul 2009 20:42:48 +0000

A couple of new machines have joined my stable, a very clean PDP-8/L and another PDP-8/E.

The /L is complete with the (somewhat important) exception of its core stack which has been lost at some point. If anyone has or knows the whereabouts of a spare stack (I believe they were common to the /I and PDP-12), please let me know. If I can’t find one I will have to resort to fabricating an alternative using NVRAM chips,although I doubt this will be trivial.

The /E is generally clean although its plexy is pretty scrappy. I quite like the dog eared look and so I will leave it this way. The console itself is missing a couple of keys although I have replacements for these. The machine came with no cards, but I have spare CPU sets and so I’m only left needing to find memory which should be achievable.