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101090 discussions

Ohio Scientific Universal RAM Board GW-OSI-RAM1

by systems.glitch＠gmail.com

Finished building a prototype mezzanine board and testing with the IM6100 (PDP-8 on a chip) in the 560Z board today. Full writeup: http://www.glitchwrks.com/2017/05/03/gw-osi-ram1-universal-ram There are a couple of tweaks required, but I should be doing a first production run of boards before long. This board is: * 128 KW, 12-bits * Optional memory management/bank switching * No hard-to-find/expensive ICs (8T26, et c.) * All through hole * Includes lamp register mezzanine header * Largeish prototype area The lamp register is on a mezzanine for a few reasons. First off, octal vs. hex grouping! It really throws me off to try and interpret one on the other. Second, it allows remote mounting on a ribbon cable, i.e. board can be mounted to a front panel. Third, I'll likely design a 7-segment version. Thanks, Jonathan

8 years, 9 months

Reviving VT220?

by aaron＠aaronsplace.co.uk

Hi all, A colleague and I are trying to get a VT220 working again as it recently died on us. We are hoping to set up a few items for the mid-80s (including this terminal) to show the graduands what it would have been like if they were doing their CompSci degree 30 years ago. It looks to me like the flyback is dead. There is a lot of soot and there looks like there is some damage to the top of the transformer, better seen in the second image. http://www.cs.nott.ac.uk/~psxasj/sparse/flyback1.jpg http://www.cs.nott.ac.uk/~psxasj/sparse/flyback2.jpg The terminal powers on and does the usual beeping but nothing is displayed on the screen. Does anyone have any advice about what to do here? Are there any sources of compatible flyback transformers? We have a second VT220 which exhibits the same behaviour, hopefully for a different reason so we can try and cobble two into one. Any thoughts / advice would be greatly appreciated. Thanks, Aaron. -- Aaron Jackson PhD Student, Computer Vision Laboratory http://cs.nott.ac.uk/~psxasj

8 years, 9 months

VCF SE Photos

by earl＠baugh.org

> Date: Wed, 3 May 2017 08:03:19 -0400 > Subject: VCF SE Photos > > Here are my photos from the VCF South East April 30/May 1. Roswell, GA > hosted by Mims' Computer History Museum of America > > http://vintagecomputer.net/browse_thread.cfm?id=677 > > Just to clarify something here about VCF South East... the Computer Museum of America (that's the official name) provides the venue for the event, but the Atlanta Historical Computing Society (AHCS) actually recruits and covers the expense for having the speakers at the show and also recruits and organizes all the exhibits of the VCF proper (aside >from the two professionally constructed and very informative exhibits that the Computer Museum provides). In the first year the Computer Museum of America did recruit the speakers, but AHCS has done it since. And the AHCS has always recruited and organized the exhibits for the VCF proper. Just want to make both of the partners in this endeavour get proper credit here. Earl

8 years, 9 months

IBM 4331 Mainframe

by ggs＠shiresoft.com

Just to let folks know that I finally moved the IBM 4331 Mainframe this past weekend >from where it was currently stored to my shop. Pictures are here: https://www.flickr.com/gp/150223282 at N04/NrX91K <https://www.flickr.com/gp/150223282 at N04/NrX91K> As can be seen in the pictures, it filled a 26? box truck that I had rented for this purpose. Right now I just have it placed somewhat in my shop. Some early tasks will be: * I have to verify that I have everything. Even if I missed some items, they won?t be scrapped. I just need to go over what is currently in my shop and verify that I didn?t leave anything behind. I?m mostly worried about cables at this point. * I have to figure out some way to produce enough ?clean? 3-phase power to run the peripherals (the CPU is 220v single phase) as I only have 220v single phase coming into my shop. Starting to power it up will probably be a while yet. ;-) TTFN - Guy

8 years, 9 months

FFS: Elgar IPS1100 UPS

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

8 years, 9 months

VCF SE Photos

by billdegnan＠gmail.com

Here are my photos from the VCF South East April 30/May 1. Roswell, GA hosted by Mims' Computer History Museum of America http://vintagecomputer.net/browse_thread.cfm?id=677

8 years, 9 months

Beautifully-posed photos of various kinds of retro kit

by lproven＠gmail.com

>From the Apple ][ up to PowerMac G4s. So, possibly a bit new for many of you folk, but I enjoyed them and thought others might too. http://podstawczynski.com/retro/beauty_shots.html -- Liam Proven ? Profile: https://about.me/liamproven Email: lproven at cix.co.uk ? Google Mail/Talk/Plus: lproven at gmail.com Twitter/Facebook/Flickr: lproven ? Skype/LinkedIn/AIM/Yahoo: liamproven UK: +44 7939-087884 ? ?R/WhatsApp/Telegram/Signal: +420 702 829 053

8 years, 9 months

Question about an SGI Fuel issue / fuel sensors ( current - temp )

by mazzinia＠tin.it

Hello, Since there are a lot of experts here ( I guess, at least ), I would like for an opinion / ideas / knowledge. I've been told that the temperature sensors on Fuels are subject to get defective. Is the same valid for current sensors ? The question is due to this... I just got a Fuel donated to me, very kindly, that didn't turn on once I tried to. (the old owner didn't turn it on in a while, I was told) I've connected to the L1 diagnostic serial port on the mb and ... The env system prevents it from turning on for 2 reasons 1) XIO V12 bias with a value of 5.81 , considered too low 2) Odyssey temp fix at 93c at box turned off But I managed to run env while the 30 seconds timer announcing the power down were running and... it shows that 12V and 12V IO are perfect with the psu "running" so... any idea if the xio v12 bias sensor is connected with the odyssey temp sensor and thus could be simply faulty. I could do a test turning off env monitoring, but I would prefer to do it only after hearing opinions . given I don't know what kind of damages could happen if v12 bias is right , instead, and the system is brought up Environmental monitoring is enabled and running. Description State Warning Limits Fault Limits Current -------------- ---------- ----------------- ----------------- ------- 12V Enabled 10% 10.80/ 13.20 20% 9.60/ 14.40 12.12 12V IO Enabled 10% 10.80/ 13.20 20% 9.60/ 14.40 12.19 5V Enabled 10% 4.50/ 5.50 20% 4.00/ 6.00 5.10 3.3V Enabled 10% 2.97/ 3.63 20% 2.64/ 3.96 3.35 2.5V Enabled 10% 2.25/ 2.75 20% 2.00/ 3.00 2.47 1.5V Enabled 10% 1.35/ 1.65 20% 1.20/ 1.80 1.47 5V aux Enabled 10% 4.50/ 5.50 20% 4.00/ 6.00 5.12 3.3V aux Enabled 10% 2.97/ 3.63 20% 2.64/ 3.96 3.29 PIMM0 12V bias Enabled 10% 10.80/ 13.20 20% 9.60/ 14.40 0.00 Asterix SRAM Enabled 10% 2.25/ 2.75 20% 2.00/ 3.00 2.52 Asterix CPU Enabled 10% 1.44/ 1.76 20% 1.28/ 1.92 1.61 PIMM0 1.5V Enabled 10% 1.35/ 1.65 20% 1.20/ 1.80 0.00 PIMM0 3.3V aux Enabled 10% 2.97/ 3.63 20% 2.64/ 3.96 3.30 PIMM0 5V aux Enabled 10% 4.50/ 5.50 20% 4.00/ 6.00 5.15 XIO 12V bias Fault 10% 10.80/ 13.20 20% 9.60/ 14.40 5.81 XIO 5V Enabled 10% 4.50/ 5.50 20% 4.00/ 6.00 2.42 XIO 2.5V Enabled 10% 2.25/ 2.75 20% 2.00/ 3.00 1.21 XIO 3.3V aux Enabled 10% 2.97/ 3.63 20% 2.64/ 3.96 1.60 Description State Warning RPM Current RPM -------------- ---------- ----------- ----------- FAN 0 EXHAUST Enabled 920 1129 FAN 1 HD Enabled 1560 2229 FAN 2 PCI Enabled 1120 1476 FAN 3 XIO 1 Enabled 1600 3869 FAN 4 XIO 2 Enabled 1600 3699 FAN 5 PS Enabled 1600 1980 Advisory Critical Fault Current Description State Temp Temp Temp Temp -------------- ---------- -------- -------- -------- --------- NODE 0 Enabled 60C/140F 65C/149F 70C/158F 20c/ 68F NODE 1 Enabled 60C/140F 65C/149F 70C/158F 21c/ 69F NODE 2 Enabled 60C/140F 65C/149F 70C/158F 20c/ 68F PIMM Enabled 60C/140F 65C/149F 70C/158F 20c/ 68F ODYSSEY Active 60C/140F 65C/149F 70C/158F 93c/199F BEDROCK Enabled 60C/140F 65C/149F 70C/158F 20c/ 68F Alessandro

8 years, 9 months

VCF SE Photos

by vintagecomputer＠bettercomputing.net

Thanks for the pics! Curious.. the Mark-8 in the museum.. that's a repro, right? ?I thought they got a few real ones from Bugbook. Brad Sent from my Samsung device -------- Original message -------- From: william degnan via cctalk <cctalk at classiccmp.org> Date: 2017-05-03 5:03 AM (GMT-08:00) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: VCF SE Photos Here are my photos from the VCF South East April 30/May 1.? Roswell, GA hosted by Mims' Computer History Museum of America http://vintagecomputer.net/browse_thread.cfm?id=677

8 years, 9 months

AB "Multibus"?

by seefriek＠gmail.com

Are Allen-Bradley Multibus-1 form factor cards actually Multibus compliant or something proprietary? KJ

8 years, 9 months

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