test-drb December 2013

test-drb@ccmp.vtda.org

158 participants
140 discussions

Island of misfit toys (or classic computers)

by ittybittybytes＠gmail.com

Rudolph and Santa has the island of misfit toys. I have the island of misfit or slightly broken classic computers on eBay 1. green screened AT&t 7300 2.Vt100 minus keyboard (powers up but screen does not go on) 3.HP 9534; powers up, attached monitor works OK but only posts intermittently. I suspect either something loose or faulty power supply. The HP and the Vt will go up tomorrow around 10 am PST http://www.ebay.com/sch/tcp1022/m.html?item=251410916240&ssPageName=STRK%3A… These were items I had on my to do list to fix, but time has run out. I am also giving a head up in that I'm selling my DECSystem 310, which is a pdp8/a housed in a metal office desk. I comes with a circa 1974 Tec 440 terminal, an LA36 and an RL01.as well as the housed RX01(2)? I'm not selling this on eBay but to any listers who might be interested. I'll post more info as soon as I take some pics and gather it all together. It will have to be freighted or picked up. I can hold it for 4-6 months if you want to come to SE AZ to pick it up (near Tucson)

10 years, 4 months

MFM prototyping

by robert.jarratt＠ntlworld.com

I need to find a way to interface a breadboard prototype to an MFM connection on a MicroVAX 2000. The cable I have is the type that connects to tracks on a two sided PCB (like the edge of any PC card that plugs into an ISA, or PCI slot), I don't know if this has a name. Is there anything I could search for that would give me small 2-sided PCBs with the tracks on each side and an easy way to connect wires from the breadboard? Another alternative would be to find single-pin sockets for the wires so that I could connect wires directly to the IDC header on the MicroVAX 2000 system board on an individual basis. I have searched for these but not found anything, do these things have a name? I suppose I could just buy or make a simple 60-way ribbon cable and push the wires from the breadboard into the socket on the ribbon cable. Any other ideas? Regards Rob

10 years, 4 months

KASIM VER 0.2 19-JAN-77 - DEC's own KA10 simulator?

by bob＠jfcl.com

I was looking at some of the diagnostics on the KLAD pack http://pdp-10.trailing-edge.com/klad_sources/index.html and I notice that this one (DAKAA - basic instruction test) has a bunch of interesting output at the end of the .SEQ file http://pdp-10.trailing-edge.com/klad_sources/01/klad.sources/dakaa.seq.html The first part is just the diagnostic operating instructions and the second part is the MACRO-10 listing, but at the end there's the output from what appears to be a KA10 simulation. The header on each listing page says "KASIM VER 0.2 19-JAN-77" - did DEC actually write a KA10 simulator ? And it's apparently more than just a simple instruction simulator too, because for each instruction there's a complete trace with all the internal time states and internal register contents for the KA10. It must be an attempt to model the internal architecture of the KA CPU. Does anyone know any more about this program? Does anyone have a pointer to the source for it? Tantalizingly there's a KASIM.SAV on the KLAD pack, but that's all. Bob

10 years, 4 months

Loading ZQRCH0/XXDP on PDP-11/23 or PDP-11/01

by b4＠gewt.net

Evening... I'm fighting with trying to get my disk formatted so I can use my PDP-11s. ;) Tape records are: 0 zrqch0 1 zrqah0 2 zrqch0 3 zrqah0 Opening port /dev/ttyUSB0 .... Port open ? Opened zrqch0 read-write rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr And it stalls after that many R and goes no further. I have no alternative means to boot XXDP on this system...my only option is vtserver until I get a drive formatted. -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects

10 years, 4 months

Question re: DMK2IMD

by snhirsch＠gmail.com

I'm attempting to convert a TRS-80 DMK image to ImageDisk format in order to write out a real floppy. The original was 80-track, DS, DD and indeed the sdltrs emulator concurs and can catalog the image without incident. The DMK2IMD utility converts it without complaint and reports: 80X6400 DSMD 250k data rate assumed But, when I fire up IMD and write it out things stop after track 39 and tell me that 2880 sectors have been written. That's the correct number of sectors, but they should be spread over 80 tracks. Clearly I'm missing something, but am not sure exactly what. The drive is 80-track DSQD and data rate is 250Kbps. I am not set for double-step and imd believes (correctly) that the drive is an 80-track unit. (I have also tried this with a more common 5.25" HD 1.2M drive - using 250k-->300k rate conversion - but the same thing happens) Steve --

10 years, 4 months

Free in Noord-Holland, Netherlands: 2x Tandem Himalaya K200, peripherals

by theodric＠gmail.com

Free to a good home: 2 Tandem Himalaya K200 mainframes (circa 1993, according to the date stamps inside), a disk array, some spare disks, two terminals, assorted system cabling, spare internal cards and spare internal disks. The fellow I got them from worked for NYSE Euronext, and said that they were used there before he acquired them through official channels after they were decommissioned. I have a printout of an e-mail to that effect, which also includes instructions for bringing them up?something I?ve never tried to do. They take a couple C19 power cords (provided) on an 8A circuit, and are reportedly working. They are large (76x102x53cm) and heavy (two strong people can lift one, just). Location is Noord-Holland, Netherlands. If you?re interested in collecting them or you are willing to arrange your own pallet collection by courier, please contact me off list. Jeremy

10 years, 4 months

[Mark@Misty.com: [rescue] HP 715/50 and 715/80 free for local pickup]

by Mark＠Misty.com

Hi, I tried the rescue lists, but maybe these are old enough for cctalk. HP 715/50 and 715/80, one HP chicklet keyboard, mouse, and a collection of HP CDROMs. These are nice and clean, include internal CDROM drives, some memory in one of them. Sorry, I used the SCSI drives from these for another project. At one point I did have one booting before then from install CDROM and from a SCSI hard drive. These are free, for local pickup, near Plymouth Meeting, PA, United States. I might be persuaded to pack and ship these if anyone has anything I am looking for in trade: - An intact DEC BA23 front, back, and floor-stand base-plate thing. - A DEC Q-Bus M7516 DELQA ethernet interface. - Other BA23 pdp11 q-bus related stuff. Mark -- Mark G. Thomas (Mark at Misty.com)

10 years, 4 months

AN/AYK-14 CDC Computers

by michael.99.thompson＠gmail.com

The RICM just received three AN/AYK-14 CDC computers as a donation. It looks like they each contain 4x 32k x 18-bit Core Memory Module, Memory Control Module, General Processor Module, Processor Support Module, and an I/O board. Anyone know about these systems? -- Michael Thompson

10 years, 4 months

cctech Digest, Vol 124, Issue 31

by michael.99.thompson＠gmail.com

> From: Al Kossow <aek at bitsavers.org> > Date: Sun, 29 Dec 2013 07:38:23 -0800 > Subject: Re: RFC Ethernet Bus Interface V1 > > So I'm back to a couple of bus translator PCBs with the actual microcontroller and FPGA on separate mezanine > cards so whatever the silicon is that the bus translators stay the same. At least that's the theory. I used this: http://www.emcraft.com/products/133#starter-kit plus some bus translators to emulate a paper tape reader on a PDP-8/L. I will use this one: http://www.emcraft.com/products/133#overview next time because it has a lot more I/O. -- Michael Thompson

10 years, 4 months

Message from BillDeg

by billdeg＠degnanco.com

Effective Immediately After 16 years of use, it's time to retire billdeg at degnanco.com. Henceforth all emails to billdeg at degnanco.com will be deleted. If you wish to contact Bill by email, please use billdeg at buzz1.com B

10 years, 4 months

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test-drb December 2013