[Coco] PC-to-CoCo data transfer techniques

[Robert Gault]

You are very limited when using the bit banger port. If you have an RS-232 
pack, you should use that.

My best results for Coco to PC transfer have been under OS-9 using OSTerm, 
an RS-232 pack, and HyperTerminal on the PC. Transfers over a null modem 
cable in both directions can be made at 19200 with no limitations on file 
size. Results are somewhat worse under Disk Basic using Ultimaterm going 
from the PC to the Coco but just as good from the Coco to the PC.

The null modem cable is made "off the shelf" parts to go from the PC serial 
port COM1 to the RS-232 connector. No wires need to be jumpered.