test-drb November 2003

test-drb@ccmp.vtda.org

289 participants
485 discussions

by dee＠orbitsystems.com

Frank, Do you still have any TIL308, BCD Display Driver LED. If you have any to sell, I would be interested to buy. Thank you, Dee Rose 949-852-9999 ext 224

21 years, 1 month

MDOS (Motorola EXORciser) disk format ?

by uban＠ubanproductions.com

A friend of mine has a pile (55) 8" floppies which were created on a Motorola EXORciser MDOS system. Does anyone know if the data on these disks can be recovered on a CPM system or similar, or will he need to find an EXORciser? --tnx --tom

21 years, 1 month

PDP-11/44 want list

by will_kranz＠SoftHome.net

John On Tue Oct 8 20:11:58 2002, you posted about your 11/44. I was searching for help with the H7140 power supply when I came across your post. I recently tried to power up a system I got a couple years ago, and have a flashing 'DC On' indicator. I don't know how serious this is, or if I might be able to repair/adjust it with some guidance. Suggestions? I have no documentation on the power supply. Thanks.

21 years, 1 month

simh

by zofeiming＠prodigy.net

Cannot ipl ibm1130 have the software don't know how to assemble boot deck what do i need to do? mark

21 years, 1 month

Friden Flexowriter interface timing signals

by tomj＠wps.com

I'm making a Friden Flexowriter simulator to bring up my LGP-21 (solid-state follow-on to the LGP-30). I do not have access to the LGP-21 Flexowriter, which is modified from a "standard" (sic) flexo in a number of ways (peculiar code set, special fromt-panel switches). I have hardware documentation for the LGP, which includes a fair chunk of Flexo data (schematic, etc) but it's not much help with the interface timing. I think it's likely the signal names are standard (sic) Friden, but I don't know. (The simulator will be PIC-based, and will diddle the interface signals under control of host-resident software, to which it'll talk to via serial port.) I'm assuming it's a "busy/done" system, eg. to print, the computer sets up print data (before point a, below) then asserts the strobe or gate on (at a). (call it Print Start, or interface "busy"). When the Flexo has assimilated the data, it asserts Print End, or "done", at b, which clears Print Start; when Print End deasserts, at c, the interface is ready to begin the next cycle: a b c +---------+ | | to flexo START -----------+ +--------------- +----------+ | | >from flexo END ---------------------+ +---- I believe receive is similar, with the directions reverse of course. Specifically, I can't determine the timing relationships of signals: (print) Tx print start? JL29 print end? (receive) Xs receive start? Sr receive end? JL12 "start input cycle" JL11 "end of flex input cycle" Receive especially bugs me, since it appears to be two sets of handshake that do the same thing. The descriptions in "quotes" are from the LGP-21 algebraic descriptions of the Flex interface. (There are also signals JL32, JL33, JL28-20, and LGP-specific Friden switches "START COMPUTE", and maybe "MANUAL INPUT", which the LGP sees in some manner.) Here's the Flexowriter cable end pinouts, if it's any help. Flexowriter connector (JL) P38, end of cable to J19. to/from flexo 01 TP5 to Print data 02 TP4 to Print data 03 TP3 to Print data 04 TP2 to Print data 05 TP1 to Print data 06 TP6 to Print data 07 Tx to Print start ("busy") 08 -60V from 09 Sr to Receive end ("done") 10 /BQ from Manual input 11 JL11 from "End of flex input cycle"? 12 JL12 from "Start input cycle" 13 P5* from Receive data 14 /P5* from Receive data 15 P4* from Receive data 16 /P4* from Receive data 17 P3* from Receive data 18 /P3* from Receive data 19 P2* from Receive data 20 /P2* from Receive data 21 P1* from Receive data 22 /P1* from Receive data 23 P6* from Receive data 24 /P6* from Receive data 25 SIGNAL GROUND 26 27 Xs from Receive start ("busy") 28 JL28-20 to 29 JL29 from Print end ("done") 30 31 SIGNAL GROUND 32 JL32 to 33 JL33 from "translator cam"? 34 SIGNAL GROUND 35 117AC to 36 117AC to 37 CHASSIS GROUND

21 years, 1 month

Apple SCSI revC

by stever＠nortelnetworks.com

Hi, I have the Rev'C' upgrade EPROM available for $12US and shipping is included.

21 years, 1 month

Compaq slt 286

by christine.saeumel＠lkh-bruck.at

I have a laptop SLT 286. On start error massage appears: 1970 Disk 0 error 162 setup not installed (run setup) Insert diagnostik diskette in the drive A (resume = "F1" key) Afterwards I can not access hard disk. Please can you send me the diagnostik diskette Prim.Dr.Stjepan Varosanec

21 years, 1 month

need addresses of some large computer junkyards

by gunther＠aurora.regenstrief.org

Hi, not that I want to go hunting on your turf :-) but I need to buy a lot of older untested RZ28 and RZ29 disks (hundreds) for cheap. So I have contacted the places I know of and may get perhaps half of what I need from one. So I need more addresses where I can ask. The focus is on computer-junkyard and not so much reseller becasue I want to buy untested possibly failed equipment. thanks four your hints, -Gunther

21 years, 1 month

Not quite 10 years old? Digital Alpha PC64 parts...

by dwoyciesjes＠comcast.net

Well, I'm finally getting around to building up my Digital Alpha PC64/275MHz box. Only problem is I have no L2 cache SIMMs, so it won't boot up at the moment. Plus, I still have to rewire my ATX power supply for it. Got the mother board connectors from a dead donor Aspen Alpine box :) Tried a regular AT power supply on the PC64, but since there is no cache, no go... Anybody know where I can get some cache for cheap/trade? -- --- Dave Woyciesjes --- ICQ# 905818

21 years, 1 month

PDP-8/I memory problem

by root＠parse.com

Hi folks, I'm in the process of restoring my 8/I, have run into a little problem with the core memory, and am out of ideas on what to do next. The symptom is that I can deposit into the core memory now (after replacing a few cards and a core plane), but I can only deposit 11 bits; the 12th bit remains 0. If I deposit 7777, I can examine and get 3777. This machine has 8k of core, and the problem is the same in both 4k banks. Here's what I've done so far to try and eliminate / narrow down the problem -- any further suggestions are most welcome! Swapped G228 A36/B36 Swapped G228 B36/B37 Swapped G021 A31/A32 Swapped G221 C37/C38 Swapped G221 D37/D38 Swapped two edge M220's Swapped G624 A38/B38 (The G221 swaps may have been related to an earlier problem, which I've since fixed) None of these swaps yielded any change in the problem... Since it affects both banks, I'm assuming it must be a problem in some common circuitry. Just so as I'm not totally embarrasing myself, the 4000 bit (the LEFT-most bit) is MB00, right, and not MB11? :-) This whole MSB = 0 and LSB = 11 is very confusing :-) Thanks! Cheers, -RK -- Robert Krten, PARSE Software Devices +1 613 599 8316. Realtime Systems Architecture, Consulting and Training at www.parse.com Looking for Digital Equipment Corp. PDP-1 through PDP-15 minicomputers!

21 years, 1 month

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test-drb November 2003