Recent content by Al Kossow

Tektronix patented a fun circuit that does n-key rollover on a switch matrix without diodes across each switch https://www.google.com/patents/US4106011A

I don't know if anyone has come across this model of 12v supply before, but it is adjustable from 0 to 12v and it works fine as an 8v supply for S-100 systems as an alternative for the monster linear non-regulated supplies normally in the system MZMW MS-600-12 https://www.ebay.com/itm/277231104802

posted on the discord by Admiral Shark in Jan 2025

Have you tried asking Dave McGuire if he could take pictures of the keyboards on his systems? https://forum.vcfed.org/index.php?threads/ibm-5324.37938/post-1320410 There is a picture of the top of the adapter board somewhere either here or on the cctlk discord but I'm having trouble turning it...

Have you made the sources for your tools (in particular the BRU unpacking tool) available?

Have you found any other tape images on bitsavers that have the same problem with duplicated blocks?

is that the right part number? I thought they were all three digit

where are you located? I have extensive scanning facilities at the Computer History Museum in Silicon Valley

detailed pictures and firmware dumps of both units would be interesting. there were versions of the 4170 that ran cpm/86 it was a pretty sophisticated raster graphics system in the early 80s I have some information on bitsavers. http://bitsavers.org/pdf/tektronix/411x...

would it be possible to get a copy of the schematics to add to the information on bitsavers?

here is the actual standard http://bitsavers.org/pdf/dec/standards/EL-00092-00-0_F_Finish_and_Color_Standard_Dec82.pdf page 53 specifies "Brite Rose" and "Morris Maroon" specified by the supplier of the silk-screen ink

I'm about to start cleaning up a sad looking MMD-1. I notice it has a 6.75 MHz crystal on the 8224. It must be dog slow.

This has been discussed MANY times. There were no Pantone colors

Is the card near the core memory? Do you have the core memory shield card in place?

Could someone upload the original 1.7 213AE firmware from soviet9932? I didn't uload it to bitsavers and the link is now dead I pushed a bunch of Informer information to http://bitsavers.org/pdf/informer yesterday