These are from Andy Key and are in M80 macro assembler format.
They work on either the Memotech MTX-512 RS-232-C expansion, or the REMEMOrizer expansion.
https://drive.google.com/open?id=1XiupZ ... 2sLyLEaFDv
-Thom
Memotech MTX-512 DART serial routines.
Also, it's worth noting that it can be tested with this emulator:
http://www.nyangau.org/memu/memu.htm
-Thom
http://www.nyangau.org/memu/memu.htm
-Thom