Could someone give me an example of a good screen shifting routine? I looked on ticalc but I couldn't find one. I particularly need one that can shift the screen to the left. Thanks

EDIT:

So I was helpfully given this routine, but could some one explain how it works


Code:

ld hl,$963F : loads the end of the screen buffer to the hl register.
ld c,$40 : loads 64 (The screen height) into c register.
ld b,$0C : loads 12 (The screen width in bytes) into b register
or a : clears the carry flag
rl (hl) : rotate the contents at hl left 1 bit. Cleared carry means 0 is written to bit 0.
dec hl : move to the previous address.
djnz $-3 : Do this loop for the whole screen width.
dec c \ jr nz,$-9 : Do this loop over the whole screen height.

Hopefully the next routines you find you can learn to analyze on your own

The hex stuff was the stuff I wasn't sure about. Thanks for explaining

I have another question. Let's say I have a value stored at the location "score". If I want to display that to the screen, and I store it in HL, what can I do to display it properly?

This is taken from the Alien Breed 5 source:

Code:
You just need to allocate a 6 byte space for "showHLBuffer", which creates a NULL terminated string based on the contents of HL, and displays it at (pencol) using _vputs. It trims off any leading zeros as well, so if HL = 143, then it displays "143", not "00143".

EDIT: If you *want* the leading zeros, you can erase the code from "ld b,4" onwards up until the "bcall(_vputs)" at the end

Thanks a lot. There's a lot more to it than I expected