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.