UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Karen's PICL

SiriusHardware · 5th Jul 2021, 9:26 pm

I wonder if this is a bit like the ZX81, where the screen update after each line entry gets slower and slower the more lines there are? If so, you would have to make the inter-line delay the maximum that it is ever likely to have to be, which in the early stages of transmission would waste a lot of time.

For optimum upload speed the system probably really needs a serial 'Wait, I'm busy' handshaking line in addition to TX/RX/GND.

Failing that, maybe write a bit of Python to open the text file and send it to the serial port character by character (at timed intervals if necessary) but with an increasing delay after sending each successive line. You could also have it strip out any unwanted non-printable characters which may have been introduced at the capture / edit stage.

5th Jul 2021, 9:26 pm	#16
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,587	Re: Karen's PICL - PCB available I wonder if this is a bit like the ZX81, where the screen update after each line entry gets slower and slower the more lines there are? If so, you would have to make the inter-line delay the maximum that it is ever likely to have to be, which in the early stages of transmission would waste a lot of time. For optimum upload speed the system probably really needs a serial 'Wait, I'm busy' handshaking line in addition to TX/RX/GND. Failing that, maybe write a bit of Python to open the text file and send it to the serial port character by character (at timed intervals if necessary) but with an increasing delay after sending each successive line. You could also have it strip out any unwanted non-printable characters which may have been introduced at the capture / edit stage.