🚀 go-pugleaf

> Does anyone out there know what format a Koala picture has to be in to be used
> on a C-128? I have a loader which works on the 64, but I am not sure where the
> memory has to be loaded into on the 128.

Since you sound familiar with the layout, and you are working in BASIC 7.0,
I will give a brief example and explanation:

        10 GRAPHIC 3,1                   :REM  MULTICOLOR GRAPHIC MODE
        20 A=PEEK(1): B=PEEK(216)        :REM  SAVE THESE
        30 POKE 216,255                  :REM  TELL IRQ TO GIVE US VIC CONTROL
        40 POKE 1, A AND 252             :REM  SELECT PROCESSOR NYBBLE BANK
        50 BLOAD "PIC.BM",P(DEC("2000")) :REM  LOAD BIT MAP
        60 BLOAD "PIC.VM",P(DEC("1C00")) :REM  LOAD COLORS 01 AND 10
        70 BLOAD "PIC.CN",P(DEC("D800")) :REM  LOAD COLORS 11
        80 POKE 1,A                      :REM  RESTORE SYSTEM NYBBLE BANK
        90 POKE 216,B                    :REM  RESTORE SYSTEM VIC CONTROL

I think you can figure it out from here.  The problem was your handling of
the color nybble banks.  There are two of them, one for text mode and one for
multicolor graphic mode, and they are controlled by the two least significant
bits of the port at $0001.  Bit 0 controls which bank the processor sees, and
bit 1 controls which bank the VIC sees.  1=text, 0=graphic.  Normally, the
editor handles all this automatically during IRQ processing.  The system
variable GRAPHM, location $D8 (216 dec), contains bits indicating the current
graphic mode (text/graphic/split-screen).  A special case, GRAPHM=255, means
YOU want to twiddle the bits, and hence the system leaves hands-off.
-- 
Fred Bowen			uucp:	{ihnp4|seismo|caip}!cbmvax!fred
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