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![]() ![]() Pc Terminal Emulator Computers Driver And AddressibleOn several Sun systems this would be handled in the openboot Forth interpreter, and the default actino was a shutdown. ISTR the distinction between those two things being important even under MSDOS the CON could be redirected to various different TTY sources, whether the default built-in keyboard and screen devices, or one of the COM ports, or the LPT, some other exotic device with an installed driver and addressible device name… etc.Whereas for an old headless Unix server, the console *has* to be a connected terminal, but one that is connected to a particular dedicated serial port, and might be switchable through a KVM-type box that tricks each server you can switch the terminal’s IO to that the terminal is connected (and idle, rather than sending breaks or whatever) even when it’s actually sending to and receiving from a different one…Some unix servers did in fact have a designated console serial port with special functionality that would shout down the system when the console (sometimes called the master terminal was powered off. Any serial terminal you might connect to it would count as an additional TTY:, not the CON.The problem is that I’ve been unable to track down enough info on the protocol. I want to wire a pigtail adapter for port 1 because the advanced functions of the hp 2621 terminal includes a full range of terminal passthrough device functions, which includes the IEEE488 bus devices and the ability to remote boot the cpm computer over serial port 1.I think a remote booting cpm computer would be really retro cool. HP sold several pigtail adapters to permit connection to a wide range of serial interfaces. Port 2 is a standard rs232c in every way, port 1 has a centronics style connector with signals for RS232, rs423, synchronous and bisynchronous signals. The computer retains all of the terminal functions, using 2 cpus (one 4mhz z80 for program execution, another 4mhz z80 for the intelligent terminal functions, and an 8031 that controlls the IEEE488 bus for attaching disk drives and other peripherals.The terminal has 2 external serial ports. What is the best pdf converter for macAnd as a mainframe that the terminal might connect to can be reasonably expected to have all kinds of voltages available well in excess of 15v both positive and negative it might not accept even +/-5v…The more likely problem though is that it’s designed for some other serial data standard than RS232, which is only really rated for cable lengths of around 15 to 50ft, and officially only 20kbit/s with the shorter cable run. So as long as the terminal is RS232 compliant, you should just be able to plug it into anything else that’s also compliant, so long as you can get the passive adaptor to mate up their ports.Though the problem you might encounter is actually with cheap USB to serial converters technically RS232 is supposed to use -12v as “0” (or idle) and +12v as “1”, but as they run off USB’s single +5V supply, and generally lack both the space and budget for a full voltage booster/inverter chip or circuit and likely just have a very simple inverter built in, can only really manage about +4.8V and -3.8V output.The letter of the standard says that anything from +3 to +15v and -3v to -15v should be accepted (with only -3v to +3v being the undefined, unacceptable zone that signals should only pass through briefly when switching between high and low), and enough devices actually produce just -5v and +5v that those levels should be accepted, but running even lower such to skirt close to the allowable minimum might end up running into incompatibilities, especially with longer cables. One could network two macs through the serial ports.Also, the RS232 standard defines everything necessary to transmit data between any two arbitrary devices, including the voltage levels and the pin assignments for various common connectors.
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