Commodore PET extensionshttps://6502.org/users/andre/petindex/extensions.html
adapter RS232 serial communications Microtech Portmaker WCS-232 Memory extensions Unknown brand PET RAM expansion PET EPROM adapter Other CPUs SuperPET Unknown brand Z80 CP/M card
Commodore hardware extension descriptions
MS-DOS Kermithttps://www.kermitproject.org/mskermit.html
a compact and efficient communications software package for IBM PCs and compatibles with MS-DOS or PC-DOS offering a wide range of faithful text and graphics terminal emulations,
Communications software for DOS and Windows 3.x,offering serial and network communications (including its own compact built-inTCP
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