test-drb September 2011

test-drb@ccmp.vtda.org

159 participants
198 discussions

by aek＠bitsavers.org

http://www.ebay.com/itm/180729353405 well, this is pretty sad. someone just scrapping the contents of a "company museum"? "Thsi auction is for a front panel from one of the last Wang 4000 Computers made This is one of only about a dozen made that was in a company museum they slated for scrap I salvaged a few parts and got some great pictures before it was dumped"

13 years, 2 months

FS: Rack, Tape and Cassette drive for PDP in Boston area

by nick.allen＠comcast.net

email me for more info, must be able to haul it away, price is negotiable

13 years, 2 months

push buttons w/ LED

by tshoppa＠wmata.com

> In Adrian's photo of the Intel MDS225 here, > http://img9.imageshack.us/img9/6826/intel2.jpg > you can see a row of eight push buttons with LEDs in them just below the > CRT. > They are a really nice push button that I have a certain affinity for. > Does anyone know who made/makes those or have a modern source for them? C&K Digitast. There are knock-offs by others that look similar and are cheaper... but don't feel the same. http://www.ck-components.com/digitast/key-switch,10465,en.html Most of the C&K switches from the 70's are available almost verbatim (modulo ROHS and whatever) today. Tim.

13 years, 2 months

Finding one IBM 2741

by spedraja＠ono.com

I'm doing a review of all the IBM stuff which I took from the Datacenter in the last cleaning. Having one 3279 in working state and one 3278 almost (the logic board needs replacement), plus one 3178 still alive and one 3174 ready to work with Hercules, I should like to get one 2741. As difficult as the lottery, I suppose, but for try it... Regards SPc.

13 years, 2 months

intel mds 225

by tdk.knight＠gmail.com

this puppy just showed up as a donation from a company thats gone belly up sadly but its now got a home. software manuals drawings even the prom reader righter could be a usefull machean. http://www.flickr.com/photos/1ajs/6171038488/in/photostream/lightbox/ anyone seen one of these befor anything need to be done befor atempting to run it?

13 years, 2 months

SC Spreadsheet

by david＠thecoolbears.org

Does anyone know where source code is for the SC curses based spreadsheet - specifically, a version that will compile on OpenVMS on VAX? I have sc-7.16, but I'm not having much luck getting it to compile (it compiles OK on Linux). I saw some indications that pre-7.x versions will still compile on VMS, but 7.x and later will not. Executables would be OK, but obviously not as good as source.

13 years, 2 months

NTSC video output from Sinclair ZX81?

by charlesmorris800＠centurytel.net

I'm dusting off my ZX81 with 16k memory pack (the pair cost me $200 in 1981!) and have already discovered that the Z80A chip has definitely gone bad. (The HALT\ output pin sits at an indeterminate-level 1.2 volts even with the logic IC removed, and the CPU is halted). I had a Z80L (good for only 1 MHz and the clock is 3.5 MHz) in the junk box, but even so, swapping it resulted in lots of activity on the address, data, read and write lines, etc. as well as video pulses coming out of the custom logic chip, pin 16. http://www.mainbyte.com/ts1000/good_schematic_hi.jpg I'd like to take the output from that pin, which currently goes to a "canned" RF modulator through a couple of resistors and a diode, and instead convert it to NTSC video, as I also have a 9" monochrome CCTV monitor (75 ohm input) which would make a compact display. Can someone help me with a simple circuit to generate the appropriate RS-170 1 volt p-p video signal? thanks Charles

13 years, 2 months

TMA-11 Read

by iamvirtual＠gmail.com

Hi, I am trying to archive my tapes. I am having difficulty reading the tapes. I tried 2 tapes that are of low importance. I am able to read the first 2 records (the first record is 14 bytes and the second record is 512 bytes). I see the tape move for the read as well as the backspace operations. I setup a simulated environment to test prior to using real hardware. Using a slightly modified version of SIMH along with PDP11GUI and a virtual tape, I successfully read virtual tapes. Now that everything is working on a simulator, I am using the same code on real hardware. The real hardware is a PDP-11/10 with 32kw core memory, TMA-11 controller with TS03 tape drive. I also have a RK-11 controller with an attached RK05j drive which is available, but is not used during this scenario. I don't know the actual format of the tape. My goal is to get a binary copy of the tape suitable for use with SIMH. Now that I am using real hardware, I am getting a Record Length Error. I set the read buffer to 2048 bytes (1024 words). The values I have from the TMA-11 registers is as follows: MTS 001105 MTC 160202 MTBRC 000000 MTCMA 000000 MTD 000000 MTRD 000000 I am looking for some source code to figure out what is going wrong. I have reviewed the simple example in the TMA-11 documentation, but proper error handling is not performed. Thanks! ; +=============================================================== ; | read ; +=============================================================== ; | ; | Read record from tape. When an EOF is detected, 'rsize' is ; | set to 0. When the second EOF is detected (ie. end of tape) ; | 'exit' is set to TRUE. ; | ; | On Entry: ; | rsize has the number of bytes in the buffer ; | ; | On Exit: ; | all registers unchanged ; +--------------------------------------------------------------- read: mov #MAXTRIES, @#retries ; maximum number of retries retry: tstb @#MTC ; is controller available? bpl retry ; no, wait for controller 1$: bit #MTATUR,@#MTS ; is tape unit ready? beq 1$ ; no, wait for tape unit dec @#retries ; bpl 2$ ; retry halt ; too many reties (bails out here) 2$: mov #rbuf, @#MTCMA ; read buffer (buffer begins at end of code) mov #174000, @#MTBRC ; max buffer size (2048 bytes) mov #60003, @#MTC ; unit #0, 800bpi, read, go 3$: tstb @#MTC ; is read complete? bpl 3$ ; no, wait for completion mov @#MTS, R3 mov @#MTC, R4 mov #0, @#rsize ; assume EOF reached bit #MTAEOF,@#MTS ; did we hit EOF? (MTAEOF is 040000 bne done ; yes, so we are done tst @#MTC ; error? bpl 5$ ; no error mov #-1, @#MTBRC ; number of records to backspace mov #60013, @#MTC ; unit #0, 800bpi, read, go 4$: tstb @#MTC ; is backspace complete? bpl 4$ ; no, wait for completion br retry ; try read again 5$: mov @#MTCMA,@#rsize ; determine number bytes read sub #rbuf,@#rsize done: inc @#reccnt ; another record (or EOF) rts pc

13 years, 2 months

RTE IV-B HP 7920 Grandfather and Primary system disc (NOS)

by hp-fix＠xs4all.nl

I've two HP 7920 RTE IV-B cartridges one Grandfather and a primary system disc for the HP 21MX both seemed to be unused and have been in storage forever..(and should be cleaned for use !) I don't have a HP 7920 drive I do have a HP 7906 in unknown condition and a HP 2113B which I love to see running RTE. So I'm looking for someone willing to : sell or trade me a HP 7920 drive, or someone transfer the data from the packs to tape or disc or any other solution which provides me with the RTE-IV software for the HP 2113. If can't get a HP 7920 then the packs are for trade. I'm living in the Netherlands so picking up a 7920 in Europe is possible, shipping the packs to the US also but only . Please react off-list -Rik

13 years, 2 months

NorthStar stuff for sale

by lynchaj＠yahoo.com

Hi, I have one complete Northstar Dimension and another only missing some parts of the power supply. Northstar Dimension computers are quite rare machines from the era of transition from S-100 to the IBM PC clones. There are also a couple of Northstar Advantages in the original boxes. The Dimensions are also in the original boxes. There are some spare parts for the Dimensions and Advantages including some software and maybe some documentation. One more item is a NorthStar 15MB external hard drive. This is quite a large and rare unit. At least this is the only one I've ever seen or heard of. I am not 100% sure but it looks like it may be a 14" hard drive platter. Seriously, this thing is as big as a full sized S-100 chassis by itself. Due to the nature of these items, they are for local pick up only. I am not interesting in shipping these items. There is also some NorthStar software in original boxes, packing, etc TSS/A HD Horizon Order Entry and Invoicing HD Advantage (2) Inventory Control and Analysis HD Advantage Graphics BASIC DOS PIO Advantage Info Manager II HD Advantage TBS/OS Advantage Enhanced WordStar Advantage CP/M (5) Enhanced WordStar Horizon dBase II Advantage CP/M (3) dBase II Horizon 8/16 Upgrade Advantage Accounts Receivable HD Horizon NorthPlan FD Advantage NorthWord II FD Advantage TurboDOS 1.1.1 Horizon NorthNet Advantage (with board) CP/M 2.2 Rev L1.0 Horizon General Ledger HD version Advantage Accounts Payable HD version Advantage Image Maker Advantage CP/M TurboDOS I am willing to sell but due to size these need to be picked up (Ohio) in person. Please contact me for more details. Thanks! Andrew Lynch

13 years, 2 months

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test-drb September 2011