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DEC-8L-D0BA-D_KP8L_Power_Failure_Option_Functional_Description_Apr69.pdf | 24-Aug-2007 19:21 | 204K |
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DEC-8L-D4BA-D_MC8-L_FuncDescr_Jun70.pdf | 22-Feb-2008 03:05 | 1.1M |
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DEC-8L-D4BA-D_MC8L_Memory_Extension_Control_Option_Functional_Description_Apr69.pdf | 24-Aug-2007 19:22 | 2.0M |
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DEC-8L-HR1B-D_8LmaintVol1.pdf | 17-Oct-2003 04:33 | 5.0M |
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DEC-8L-HR2A-D_8Lschem_Feb70.pdf | 17-Oct-2003 04:32 | 2.7M |
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DEC-8L-I1AA-D_MC8-L_Inst_Mar70.pdf | 22-Feb-2008 03:05 | 271K |
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 |
Optional data break interface
Optional memory parity
Optional power fail
Optional high speed reader and/or punch
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.
