I guess the question for you is, what terminals does this vintage computer support?
minicom seems to be setup to emulate a vt100. I know of some emulators for Heath/Zenith H19 terminals - which is an extension of VT52 I believe. That's about all that I've dealt with myself.
Seeing a list of what this vintage computer supports might help find one that's got a modern emulation.
Doug, some of these are printer drivers.
AB62 TDV 4 AB62A TDV 5 AB62X TDV 4 ADOBE TDV 1
ALPHA TDV 3 ALPHAA TDV 4 AM6X TDV 3 AM60 TDV 3
AM62 TDV 3 AM62A TDV 3 AM62AB TDV 4 AM62C TDV 4
AM62CG TDV 4 AM62F TDV 4 AM62GF TDV 4 AM62GM TDV 4
AM62M TDV 4 AM62N TDV 4 AM65 TDV 4 AM65A TDV 4
AM65AX TDV 4 AM65EX TDV 4 AM7X TDV 3 AM70 TDV 3
AM70AW TDV 3 AM70E TDV 3 AM70EG TDV 3 AM70EW TDV 4
AM70G TDV 3 AM70GW TDV 4 AM72 TDV 4 AM72A TDV 4
AM75 TDV 4 AM75EX TDV 4 AM75G TDV 4 AM75GX TDV 4
A70EGW TDV 4 DIABLO TDV 1 FLACOL TDV 7 FLIP TDV 1
FLPA60 TDV 5 FLPA62 TDV 5 FLPCOL TDV 6 FLPCOM TDV 6
FLPW50 TDV 6 FLP210 TDV 6 FLP62 TDV 6 FLP62A TDV 6
FLP62B TDV 6 FLP62D TDV 6 FLP62X TDV 6 FLP65A TDV 6
FLP925 TDV 5 FLP950 TDV 6 FLWCOL TDV 6 FLW62A TDV 6
FPCCOL TDV 8 FWSCOL TDV 8 FWYCOL TDV 7 F72COL TDV 7
HPJET7 TDV 1 HPJET8 TDV 1 LASWRT TDV 1 MACCOL TDV 9
SOROC TDV 2 SOR135 TDV 3 TELTYP TDV 1 TK4105 TDV 4
TVI925 TDV 2 T1340 TDV 1 T1350 TDV 1 T950 TDV 3
WYSE TDV 4 WY50 TDV 3