(HP71B) Speed experience with Video (EMU71 and Video80 screen)

[Sylvain Cote]

(10-24-2023 09:13 AM)floppy Wrote:1. However, since I experienced 2x memory lost, I saved the FORTHRAM on virtual drive with ( basic prompt ) COPY FORTHRAM TO :HDRIVE1 and hopefully that will work

You could also add another RAM module, make it an IRAM (with FREE PORT) and then copy your FORTHRAM file into it.
An IRAM is not cleared when you get a "Memory Lost".

(10-24-2023 09:13 AM)floppy Wrote:2. the interaction with the video80 in EMU71 is very slow. I suppose this represent the reality when a 80 column screen is connected to an HP71B. Correct?

If you are using DISPLAY IS then DELAY 0,0 and a WIDTH of 80 would help.

(10-24-2023 09:13 AM)floppy Wrote:DRAW-FRAME takes 1min37s in a standard speed EMU71

Wrong strategy, use low level HP-IL commands to speed things up and use escape sequences to position the display cursor at the desired place on the external video display.

HP-71B BASIC commands are easy to use but not necessary fast, if you want to speed things up, you need to understand how things are working underneath and drive them directly.