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APPENDIX H
ORIGIN:SPECTRAL ASSOC
SUPER EXTENDED BASIC UNRAVELLED II
SUPER EXTENDED BASIC ROUTINES AND ENTRY POINTS
REVISED:12/26/1999 WALTER K ZYDHEK
Listed below are several routines in the Super Extended Basic ROM (which run in
RAM). These routines should be used with great care since they usually expect
that some of Basic's variables have been initialized to a certain range of
values in order to function. If the routines encounter an error, they will
exit to Basic's error processing code. The user must be aware of this fact
and intercept Basic's error routines if you are to stay in control while
using these routines. Some of these routines may also change the MMU registers
- BEWARE!
MODIFIED*
REGISTERS
ADDRESS
DESCRIPTION
none
E0CB
ENABLE HGET/HPUT BUFFER - Put the HPUT/HGET buffer
block (6.4) into the logical address space. Exit with
the MMU register images restored to 'normal'.
A,B,X,Y
E0F1
PROGRAM MMU REGISTERS - Program the 16 MMU registers
with the 16 bytes pointed to by the X register.
B,X
E58E
GET LONG ADDRESS - Convert FPA0 into a 'long' (512K)
address. Return the block number of the address in
ACCB and the remaining 13 bits of the address in X.
A,B,X
BUTTON+13
(E5BE)
READ JOYSTICK BUTTON - Read the joystick button
specified in ACCB (0-3) and return the status in FPA0.
A,B,X,Y
E5FA
DISPLAY DEFAULT RGB COLORS - Copy Basic's default RGB
palette register colors into the palette registers.
A,B,X,Y
E606
DISPLAY DEFAULT CMP COLORS - Copy Basic's default CMP
palette register colors into the palette registers.
A,B,X,Y
E634
COPY PALETTE IMAGES - Copy the palette register color
RAM images into the palette registers.
A,B,X
CLRHIRES
(E6D8)
CLEAR THE HI-RES GRAPHICS SCREEN - Clear the hi-res
graphics screen to the palette register number in ACCB.
A,B
PIXELFIL
E742
FILL ACCB WITH PIXELS - Fill ACCB with pixels composed
of a specific palette register. Enter with ACCB Containing the palette register number used to fill ACCB.
A,B
E792
TURN ON A PIXEL - Turn on the pixel which is being
pointed to by the X register (screen address) and bit
position specified by ACCA (pixel mask) to the color
in ALLCOL. Set CHGFLG <> 0 if pixel was unchanged by
the action.
A,B,X,Y
E7B2
EVALUATE HI-RES COORDINATES - Evaluate two expressions
in a Basic Line. Perform hi-res coordinate range checks
H1