test-drb January 2021

test-drb@ccmp.vtda.org

114 participants
96 discussions

M688 Flip Chip Unibus Power Fail Driver Modules

by jnc＠mercury.lcs.mit.edu

> From: Steven Malikoff > Would that be part of this system at a Japanese computer museum? ... > the 11/05 has 'Unichannel15' on it Yes, the 3 bays in the center are a PDP-15. (The indicator panel at the top of the center bay is the one for the PDP-15 CPU; you can see it here: http://ana-3.lcs.mit.edu/~jnc/tech/DECIndicatorPanels.html at the top of the 'PDP-15' section.) The Unichannel 15: https://gunkies.org/wiki/UNICHANNEL_15_System is undoubtly there to drive the RK05; I don't think there's a native PDP-15 controller for that. > There is an 11/15 ??? Is that a typo for 'PDP-15'? The -11/15 looks just like an -11/20 https://www.ricomputermuseum.org/collections-gallery/equipment/dec-pdp-1115 except it only has 16 address switches, not 18 as on the /20. (The front panel shown there has an OEM-specific re-paint; I couldn't quickly turn up an image of a DEC /15 front panel.) Noel

3 years, 11 months

Bendix G-15 and Control Data 160 console on ebay

by p.gebhardt＠ymail.com

If anybody of you has been looking for a Bendix System or a CDC 160 console and has deep pockets: That's your opportunity ;) ebay numbers 203239156838 and 203239181341 Not affiliated with the seller. Just saw the listings - can't believe that such cool systems are still stored in some warehouses in the U.S. for business purposes ... Cheers, Pierre ----------------------------------------------------------------------------- http://www.digitalheritage.de

3 years, 11 months

M688 Flip Chip Unibus Power Fail Driver Modules

by jnc＠mercury.lcs.mit.edu

> The "Spare Module Handbook" lists: > ... > MX11-B I apparently can't read. Should be "MX15-B": https://gunkies.org/wiki/MX15-B_Memory_Multiplexer Noel

3 years, 11 months

test please ignore

by jwest＠classiccmp.org

Test, please ignore.

3 years, 11 months

M688 Flip Chip Unibus Power Fail Driver Modules

by jnc＠mercury.lcs.mit.edu

> From: Ethan Dicks > what are these found in? The "Spare Module Handbook" lists: RH11-AB TM11, TMA11 MX11-B Does _anyone_ actually have an MX11? Any documentation would also be welcome; all I've been able to find out about it is a listing for the addresses of control registers. Noel

3 years, 11 months

M688 Flip Chip Unibus Power Fail Driver Modules

by jnc＠mercury.lcs.mit.edu

Anyone need/want a couple of these? Someone has a group of 5 for sale on eBait (#184317666245), and I want a couple, but not _5_. The seller didn't respond to a request to split up the lot, so I'd like to go in with a couple of other people on the. Any takers? Noel

3 years, 11 months

DEDICATED HOBBYIST ALERT: IBM AS/400 9406-F2 for cheap sale in Germany

by poc＠pocnet.net

Hello, to fellow readers in Germany and surrounding areas: HUGE 9406-F2, 300?, pickup in Heidelberg, Germany. Might be a Multiprocessor-Machine. https://cgi.ebay.de/174577267021 I?m not related to the seller. Have seen this by chance. I requested more photos to see what machine it is. Would be very sad if it will be scrapped. I can forward the additional photos as email on request. :wq! PoC

3 years, 11 months

KL11 asynchronous serial line interface on eBay

by jnc＠mercury.lcs.mit.edu

Here: https://www.ebay.com/itm/284137678274 and: https://gunkies.org/wiki/KL11_asynchronous_serial_line_interface if you want to know what it is. The lot includes an M105 Address Selector and an M782 Interrupt Control (which you'd need to actually use it); the price for the group is quite reasonable. Noel

3 years, 11 months

Dec RQDX: What kind of chips on it?

by cz＠alembic.crystel.com

Can someone check to see if a RQDX2 used the Western Digital chips to interface to MFM drives? Reason I'm asking is the MFM emulator can identify an RQDX3, and also a Pro/350 controller but this particular RD52 I have (which was verified by me to run Digital Mumps) is reading as: root at beaglebone:~/mfm# ./mfm_read -a Board revision C detected Found drive at select 3 Returning to track 0 Drive RPM 3525.4 Matches count 36 for controller WD_1006 Header CRC: Polynomial 0x1021 length 16 initial value 0xffff Sector length 512 Data CRC: Polynomial 0x1021 length 16 initial value 0xffff Interleave mismatch previous entry 0, 9 was 1 now 0 Selected head 8 found 0, last good head found 7 Read errors trying to determine sector numbering, results may be in error Number of heads 8 number of sectors 18 first sector 0 Unable to determine interleave. Interleave value is not required Drive supports buffered seeks (ST412) Disk has recalibrated to track 0 Stopping end of disk search due to recalibration Number of cylinders 512, 37.7 MB Thanks! CZ

3 years, 11 months

Keyboard storage, part 2

by aperry＠snowmoose.com

An update on keyboard storage, which I asked about here last month. I ordered some USPS Large Flat Rate Priority Mail "board game" boxes. This is a size not usually available at the post office and come 25 in a pack. They are a good size for mailing (and I am glad that I ordered them so I can use them for that), but I don't think they work for keyboard storage. They are so much larger than the keyboards that I am storing that lots of packing material is needed so they don't move around. Also, they are designed to be sealed and shipped, so there isn't a convenient way to open them once they have been closed. Next, I ordered the Uline keyboard boxes. I had to get 25 of them and they are not free ($2.70 per box plus tax and shipping). They can be open and closed. They are a much closer to the size of a keyboard (surprise, surprise!) so not much packing material needed, but they are slightly smaller than a Sun Type 5c (as well as Axil) keyboard and needed to modified for those two. No modification needed to store a Sun Type 4 or CompuAdd Sun-compatible keyboard in one. I haven't tried a Sun Type 6 yet. To anyone in the Seattle area that need keyboard boxes, I will probably have 10-15 of them once I get all of my keyboards packed. If you would like any, let me know. alan

3 years, 11 months

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test-drb January 2021