Teletype 43

Fred Cisin cisin at
Mon May 22 14:26:18 CDT 2017

On Mon, 22 May 2017, Paul Koning via cctalk wrote:
> Does your PC have real RS232?  A lot of "RS232" ports are serial ports, 
> but not with correct RS232 levels.  If you have "TTL RS232" [sic] it 
> won't work with an actual RS232 port.

The "CLASSIC" example: manager of the Radio Shack Computer Center told me 
that the TRS80 Model 1 Expansion Interface RS-232 board was, "by 
definition" completely "standard" for RS-232, since "RS-232" stood for 

More information about the cctalk mailing list