Al Kossow's latest activity

Thanks AL, the scans look great!

are you in a hurry for these? we probably have them in the unsorted boxes of DEC paper tapes from The Computer Museum

The ap-120 and fps-100 schematics are up now under http://bitsavers.org/pdf/floatingPointSystems The ap-120 were blueprints so they are...

Tektronix patented a fun circuit that does n-key rollover on a switch matrix without diodes across each switch...

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...

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...

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...

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...

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.