[COFF] DDP-516 hardware (was: 516-TSS Documents)

[Redirecting to COFF] On Monday, 23 November 2020 at 8:42:34 -0500, Noel Chiappa wrote: I worked with a DDP-516 at DFVLR 46 years ago. My understanding was that the standard equipment included two different channel interfaces. One, the DMC (Direct Multiplexer Control, I think) proved to be just what I needed for my program, a relatively simple tape copy program. The input tape was analogue, unbuffered, and couldn't be stopped, so it was imperative to accept all data as it came in from the ADC. But the program didn't work. According to the docco, the DMC should have reset when the transfer was complete (maybe depending on configuration parameters), but it didn't. We called in Honeywell support, who scratched their heads and went away, only to come back later and say that it couldn't be fixed. I worked around the problem in software by continually checking the transfer count and restarting when the count reached 0. So the program worked, but I was left wondering whether this was a design problem or a support failure. Has anybody else worked with this feature? Greg -- Sent from my desktop computer. Finger grog(a)lemis.com for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft mail program reports problems, please read http://lemis.com/broken-MUA