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

[Sylvain Cote]

IMHO, the best strategy for a clock block-style graphic output to an external display would be to:

• deactivate the display redirection (DISPLAY IS *)
• create a string (S$) that would hold the startup configuration: screen size, cursor off, etc
• create a string (L$) that would hold the leave configuration
• create a string (F$) that would hold the frame
• create a string (T$) that would hold the time
• pre-generate the startup configuration string (mostly escape sequences) and save it to S$
• pre-generate the leave configuration string (mostly escape sequences) and save it to L$
• pre-generate the frame string (cursor position escape sequences and frame characters) and save it to F$
• send S$ to external display
• send F$ to external display
• loop-begin
• generate the time string (cursor position escape sequences and digit characters) and save it to T$
• send T$ to external display
• if exit key pressed then send L$ to external display and exit
• loop-end