AK6DN's latest activity

And note a significant portion of that code is the M9312 processor 'diagnostic test code' that could logically be pruned out. Only about...

Well, I would measure the min/max voltage at each and every pin, preferably dynamically on a scope. Should never be much above 5.5V...

Space available to add a heatsinks on top of the suspect chips? Like this...

I don't know exactly what PDP-11 and boot mechanism you are using, but generally speaking the answer is yes. For example, on a unibus...

Try this: https://github.com/AK6DN/rx02_emulator/blob/master/disk_images/RT11.RX1

"Extended March C-" is what I based the test strategy of my MEMX memory diagnostic on. In the attached pdf, see pp. 48-53 for a...

177456 is the RC11 disk controller data register RCDB per PDP11 processor handbook. Will timeout access trap on your system (or it should).

And while you are spending all your crypto profits on that PC04, you can pick up this too ... https://www.ebay.com/itm/126379476903...

It certainly is true that if you have no working memory you can move to cover the physical 0-8KB or so address space loading and running...

My bad. Correction: it DOES require a PDP11 with memory management, so 11/03-04-05-15-20 are not supported. 16KB is the minimum required...

FYI I have my home grown memory diagnostic I use for checking my 11/34 and 11/44 systems. Requires only a bare minimum of the first 8KB...

This one?

My DEC replacement parts notes indicate a D664 can be replaced by a 1N3606 (older and hard to get) or a 1N4153 (still available from...

It's finally done! After something like two months and a half since getting all the parts together (and starting this thread) I can...

The 11/20 was the only member of the series that was NOT microcoded. I don't believe there is even one PROM in the 11/20 design. Just...