alex.freed.007@gmail.com wrote:
On Jan 15, 4:32 am, Steven Hirsch <snhir...@gmail.com> wrote:There were definite speed limitations when using the host computer's serial interface, so don't expect it work fast than 9600 baud.Well, I don't think the (affordable) modems at the time were very fast. I probably bought anything faster than 2400 baud no earlier than 1989. Clearly having to go through the z80<->6502 channel for every character sent or received was not very fast.
The ring-buffer driver was interrupt driven and held 256 characters on the Apple side for programmed retrieval. I _think_ I was able to get 9600 baud file transfers using that arrangement. In terminal mode, 2400 was the limit without character loss. There, you took the overhead in both directions since the displayed text had to go back over the interface with each character received.