Vtserver, pdp11/34, and saving images

-----Original Message----- I am using a standard DL11-W for the TU-58 serial interface, but modified it to support a 115.2kb data rate. This means that for each incoming character the 11/34 has about 90usec or so to process it. More than enough time to read it from the DL11-W, store it in memory, manipulate some counters, etc. The XXDP TU58 driver can handle this, as it is not interrupt driven, it is polled. I haven't tried the RT-11 TU-58 driver at this rate, but it may have issues as I believe it is interrupt driven. It would be an interesting experiment. On the host side I am using my TU58EM program on a PC. It can easily handle the 115.2kb serial data rate. This is a standard 11/34A with MS11-L MOS memory array, no cache option. I have been using this configuration for a few weeks now and have seen no issues at all in loading and running XXDP diagnostics from this emulated TU58 device. My mod is not specifically described, but there is at least one web page out there that describes modding the DL11-W for higher baud rates. That page described the crystal and divider changes, but did not go as far as changing the UART to a newer version capable of 115.2Kb. Don Hi Don, after a long time of no activity at all, I am building my museum. All the years of idling is not becoming for old PDP-11 systems :-< The 11/60 CPU run, but memory has random bits set. Not yet investigated. Moved on the the 11/70. After a check I powered up: no lights at all! Then on to the 11/84. Still the problem it already had; it runs to "4" but nothing appears on the VT510 :-< Just by luck, I did some timing measurements for a friend on an 11/94. As it is just an 11/94 box without any peripherals, I used TU58EM. First I toggled the TU58 boot code from EK-OTU58-UG-004 Appendix A in. Every time TU58EM reports a packet error. Running at 9600 Bd. The flags -t or -T does not improve that. Then I toggled the TU58 boot code from EK-OTU58-UG-002 Appendix A in. Again, no luck. But then I Used the -T flag ... I get the RT11 . prompt. And it works at 9600 Bd and at 19k2. I can repeat the experiment running at a higher baudrate to see whether RT11 can cope with the higher speed ... I would be surprised (positively) if RT11 can handle 115.2 kBd. - Henk