slot the VICMON cartridge into your VIC20
start VICMON by entering: SYS 24576
We want to accomplish the following:
- start program at 1400 and load the clear screen character ($93) into the accumulator
- run subroutine ($FFD2) to output the clear screen character ($93) from the accumulator
- end the program
.A 1400 LDA #$93
.A 1402 JSR $FFD2
.A 1405 BRK
.A 1406
test the program from VICMON by entering: .G 1400
the result will be a clear basic screen with the VICMON information (because we are still running it)
place a clean cassette into the datasette
save the program to tape by entering: .S "CLEARSCREEN",01,1400,1406
press record & play on the datasette as required
when saving is completed, reset your VIC20
rewind cassette
load the program in BASIC by entering: LOAD "CLEARSCREEN"
press play on the datasette. The VIC20 will now be SEARCHING FOR CLEARSCREEN
when CLEARSCREEN is found, the screen will prompt "READY"
run the program by typing: "SYS 5120"
the result will be a cleared BASIC screen
CONGRATULATIONS!
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