test-drb April 2017

test-drb@ccmp.vtda.org

169 participants
185 discussions

by cclist＠sydex.com

Much of what used to be power-hungry connectivity hardware for me has gone low-power, so I'm scaling back my UPS setup some. I've got an Elgar IPS1100, nominally rated at 1KVA sine-wave continuous (9.2A 60 Hz 120VAC). It's a pretty good-sized UPS, with fan cooling. It takes 48V in SLA cells (has an internal shelf for 8 6V 12AH ones), but I've always run it from 4 garden-tractor batteries. It's pretty good-sized; about 12"x13"x15" and heavy (big transformer). Made in 1990, has 6 AC receptacles on the back along with an RS-232 connector for status notification. Back in the day, this was a pretty high-end unit; manufacture date is 05/90. Yours for shipping; batteries not included. --Chuck

6 years, 11 months

Looking for TRS-80 Model parts (and/or someone in the Phoenix, AZ area)

by COURYHOUSE＠aol.com

is the 12 the thing that looks like a trs 80 mod 2 in size? if so i have some what is the history behind your unit!?!?!?!?!?!? Yes--- I am in Phx! Ed# In a message dated 4/23/2017 8:14:33 P.M. US Mountain Standard Time, cctalk at classiccmp.org writes: Just picked up a TRS-80 Model 12, and it boot to the "insert disk prompt" ... Yay! But, no card cage, and no KB (and no disks, but those might be easier to find) Found a seller of a model 12 with these items, but local pickup only. I'd like to get this unit up to the Model 16 specs, with Xenix on it. I see the cards are available, but without the cage, no joy. Jim -- Jim Brain brain at jbrain.com www.jbrain.com

6 years, 11 months

os8diskserver help?

by tomjmoss＠googlemail.com

Hi All, I'm in the process of building and restoring a PDP-8/e, and now I've got a second serial card I'd like to give OS/8 a try. I'm pretty sure I've got the boot loader entered properly, and the address + baud rates set correctly on the PDP and PC. When I start os8diskserver with "./os8disk -1 ../disks/diagpack2.rk05", it gives the welcome message. When I start the 8/e, It says: Booting... Done sending block 0 ^ and appears to freeze there. (the 8/e doesn't halt) I've got a RS-232 tester (blinky light box) hooked up to the port, which seems to indicate that nothing is being sent after Block 0 has been sent. Does anyone know what's going on, or what I'm doing wrong? Regards, -Tom

6 years, 11 months

Something for the P3 you have in your back yard

by aek＠bitsavers.org

http://www.ebay.com/itm/Vintage-Military-IBM-Computer-/201911842662 https://fas.org/man/dod-101/sys/ship/weaps/an-uys-1.htm

6 years, 12 months

Bulk tape eraser

by mloewen＠cpumagic.scol.pa.us

Looking for recommendations for a bulk tape eraser for SDLT and DLT IV tapes. Mike Loewen mloewen at cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/

6 years, 12 months

Oscilloscope Recommendation

by shadoooo＠gmail.com

Hello, all fine with Rigol or similar oscilloscopes, but there's a very important technical specification that often is not considered, which really DOES the difference between a cheap oscilloscope and a powerful one: waveforms per second. Suppose you are searching for a rare glitch, or that you are trying to trace an edge of a signal with infinite persistence. If the scope is a DSO, it just takes a sampling window, the memory is full and requires data processing and display, in the meantime the signal is not analyzed, and you can lose important events. A DPO can capture the signal continuously, or at least with very short death time, and the display is updated using a large number of triggered sampling windows. Of course this kind requires a far powerful acquisition circuit. I really like DPO scopes in place of DSO, for example used Tek TDS540C or D, they are quite cheap, no electrolytic caps, and can be optionally expended to increase acquisition memory depth. Display is small and grey, but you can use a VGA monitor. My two cents. Andrea

6 years, 12 months

mx-80 for free

by db＠db.net

I found an Epson MX-80 in my pile of junque. I'd rather not ship but Ottawa, Montreal or Toronto are all possible. Otherwise, out to recycle. -- - db at FreeBSD.org db at db.net http://www.db.net/~db

6 years, 12 months

Oscilloscope Recommendation

by michael.99.thompson＠gmail.com

The RICM just received $1,000 to buy a new oscilloscope. I would like a four channel. and color would also be nice. The bandwidth doesn't need to be high because we usually work on ancient equipment. What would you suggest? -- Michael Thompson

6 years, 12 months

Reviving VT220?

by w9gb＠icloud.com

The High Voltage capacitors 600 to 2,000 VDC have a finite life. Unless you checked for leakage or ESR .... be suspect of values in range. Since you are in the UK, Farnell/element14 may be the best parts distributor. ASC Metalized Polyester Film, 6 kVolts http://www.justradios.com/ASCcapacitors.html Metalized Polypropylene Film, 1600 volts http://www.justradios.com/MPMcapacitors.html ==== DEC VT-220 : AMP/Tyco Mate-N-Lok http://avitech.com.au/?p=252 greg Sent from iPad Air Sent from iPad Air

6 years, 12 months

HP 1331A X-Y display blanking

by jules.richardson99＠gmail.com

Has anyone got a manual for an HP 1331A X-Y display? It's a storage-tube device, and I'm curious to know if there's a way of triggering the erase function remotely rather than having to physically prod the erase button on the front. The rear just has X-Y-Z inputs, and I *think* that X-Y are supposed to be in the order of +/- 1V, while Z is the intensity with 0V being full and around 1V being off. Maybe throwing a negative voltage at Z erases, or something, though. cheers Jules

6 years, 12 months

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test-drb April 2017