My initial post was a bit too long so I decided to make it simpler. :-)
Z-Ram's manual indicates that it has an RS-232 interface.
Did anyone ever use it?
Here is what the manual says:
Using the CP/M RS-232 serial port
Under CP/M, Z-RAM gives you a fully bidirectional RS-232 serial port which you can use to run a printer, or, by using what is referred to as the "reader" and "punch", you can configure the port to accept a modem, plotter or other peripheral that is not supported in the standard CP/M system.
The manual also provides the following diagram for RS-232 connections.
Shouldn't there be a TTL/RS-232 level converter with this circuit, I mean we wouldn't want +/-13 volts on the computer or on the expansion board right?
I'm not even sure where this connector is supposed to go, probably the user port but I can not be sure
Note that the diagram says 'TTL level connector' so it seems it's a half-ass interface.
Does anyone make any sense out of this? Can anyone understand where this connector goes to?