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1983-09-09
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965b
Date: 21 July 1981 2201-EDT (Tuesday)
From: Bill Sholar <William.Sholar at CMU-10A>
Sender: William.Sholar at CMU-10A
To: INFO-CPM
Re: TRS-80 Model II MODEM Equates & Ports
Since the documentation on the Mod 2 TRS-80 does not bother
to discuss hardware, the following port addresses and equates for
MODEM.ASM programs might prove useful to anyone using this machine:
MODCTLP EQU 0F6H ;status/control port A
MODSNDB EQU 04H ;bit 2 indicates ready to send
MODSNDR EQU 04H ; with the bit set to 1
MODRCVB EQU 01H ;bit 0 indicates character received
MODRCVR EQU 01H ; with the bit set to 1
MODDATP EQU 0F4H ;data port A
These values, plugged into MODEM.ASM, allow the TRS-80 Mod 2 to
function without any special system calls or other variations from the
existing MODEM.ASM program, assuming the port has been set up using the
SETUP (Pickles & Trout's CPM), CONFIG (Lifeboat's CPM) or SET (Cybernetics'
CPM) utility for the appropriate baud rate, etc.