MattisLind's latest activity

A Historic Discovery in Retrocomputing: A Videotel BBS Server Resurfaces from a DEC VAXstation II One Sunday in June, thanks to a tip...

I think that the -9V is used for the ethernet tranceiver. They are usually isolated from the rest so that is why you only get good...

It is still development, for sure it is not a finished product. It does work fine to test regular logic boards. It was when it came to...

We had a nice collection of DEC front panels donated yesterday. Any idea what the that says "Digital Equipment Corporation" came from?

The power supply is generating the logical signal but that doesn’t imply that it is sourcing any current. The source of the logical...

It was entirely designed by Anders. He shall have all the credit. I have been with him in this project throwing ideas and testing. One...

The BRS-tester by Anders Sandahl works with negative logic. https://github.com/anders-bzn/brs-tester

I had a quick look at the H780 schematic since there are no known scans of the H7864 schematic AFAIK. The H780 uses N JFET. That...

I don’t think you understand how the Qbus works. The Qbus is a bus where drivers with open collector or open drain is connected to...

Dear mpiazza, Finally perhaps you will read my repsonse, sorry it has to be with all the world to see, but you do not seem to be...

First steps :) Three days, about 15 hours :) RSTS>dir Directory of RSTS 15.06.2025 01:51 <DIR> . 13.06.2025 18:46...

Content of RSX-11M-Plus 4.6 Distibution Tape 2 # # -unpack "BB-J0830-01_M01 RSX-11M-PLUS V4.6 DIST 16MT9.tap" "@BB-J0830-01_M01...

I can confirm the Mattis IDE adapter and ST3250A work

I've been working on emulation of the RT PC in MAME and struggling with a similar issue. I now believe that the RT firmware and VRM...

Strangely there are no send message button on your profile. Other users have this button.. I know it used to work but not this time...