About the replacement of the indicator with BASIC.

[apollo21]

japan.maxim-ic.com/appnotes.cfm/an_pk/1880

In Japanese. Might help you.
[edit] looks like the pages is in Japanese, but the note is still in English.. Do you have a japanese wikipedia ? Try a search for Multiplexing or Charlieplexing.

bill.

The page of the reference was seen.
Use of nine bits and LED7SEG9 digit display to purpose
It is a thing to display the LED7SEG10 digit by using ten bits.
The example is recorded in the assembler.
(led/8x7s8pin.htm)

Not to use special IC but to make programs such as PIC and SX from BASIC, do you want to become the example of the practice like any?