mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-25 06:31:25 +00:00
107 lines
4.5 KiB
Plaintext
107 lines
4.5 KiB
Plaintext
System Specific Header File Specification
|
|
|
|
The very first directive of the program must be
|
|
|
|
#include <header.h02>
|
|
|
|
where header.h02 is the system specific header file, (e.g. apple1.h02,
|
|
vic20.h02, etc.).
|
|
|
|
Note: This will probably be replaced with a command line parameter
|
|
(e.g. '-s apple1', '-s vic20', etc...) to allow program portability.
|
|
|
|
If compatibility with the C02 Standard Libraries is needed, the following
|
|
functions must be defined:
|
|
|
|
c = plkey(); Polls keyboard and returns raw ASCII character
|
|
corresponding to last/current pressed key.
|
|
|
|
Returns constant NULKEY (usually 0) if no key was
|
|
pressed.
|
|
|
|
c = rdchr(); Waits for a keypress and returns the raw ASCII
|
|
character corresponding to the pressed key.
|
|
|
|
Note: Usually a loop that calls plkey(), but may
|
|
also directly call a system subroutine.
|
|
|
|
c = getkey(); Waits for a keypress and returns the cleaned
|
|
ASCII value corresponding to the pressed key.
|
|
|
|
Note: Calls rdkey() followed by any necessary
|
|
character code conversions. This can be due to
|
|
high-bit being set by keyboard decoder,
|
|
non-standard key mappings, keys that generate
|
|
escape sequences, etc...
|
|
|
|
prchr(c); Writes character c to the screen.
|
|
|
|
Note: Does any needed ACSII conversions, then calls
|
|
the native print character routine.
|
|
|
|
newlin(); Advances the cursor to the beginning of then
|
|
next line.
|
|
|
|
Note: Depending on the system, this will usually
|
|
output a Carriage Return, Line Feed, both.
|
|
|
|
delchr(); Delete character to left and move cursor one
|
|
character to the left.
|
|
|
|
Note: Depending on the system, this will usually
|
|
print one or two delete or backspace characters, and
|
|
possibly a space to overwite the deleted character.
|
|
|
|
clrscn(); Clears the screen. On systems without this capability,
|
|
such as the Apple 1, this function should simply
|
|
return without performing any actions.
|
|
|
|
Note: Depending on the system, this will may either
|
|
print the clear screen control character or execute
|
|
the native clear screen routine.
|
|
|
|
setpos(col,row); Moves the cursor to the specified column and row. On
|
|
systems without this capability, such as the Apple 1,
|
|
this function should simply returns without performing
|
|
any actions.
|
|
|
|
col, row = getpos(); Returns the cursor's current position. On systems
|
|
without this capability, such as the Apple 1,
|
|
this function should return the values 255, 255.
|
|
|
|
wid, hgt = getsiz(); Returns the size of the screen in columns, and rows.
|
|
|
|
Note: This may call a system subroutine, read system
|
|
variables, or simply return hard-coded values.
|
|
|
|
along with the Zero Page locations (each pair of which must be sequential)
|
|
|
|
srclo, srchi Source String Pointer
|
|
dstlo, dsthi Destination String Pointer
|
|
stklo, stkhi Stack Pointer
|
|
|
|
the following locations that may be Zero Page, but don't have to before
|
|
|
|
temp0, temp1 Temporary variables used by stdlib.asm
|
|
temp2, temp3
|
|
|
|
and the following locations that must be preserved between function calls
|
|
|
|
random Storage for the Random Number Generator
|
|
|
|
Contains the last number generated and is used to
|
|
generate the next number in the sequence
|
|
|
|
rdseed Seed for Pseudo-Random Number Generator
|
|
|
|
Usually a counter or timer. If one is not provided
|
|
by the system, should be generated by incrementing
|
|
in the plkey(), rdkey() functions.
|
|
|
|
and the constants
|
|
|
|
DELKEY ASCII code for Delete/Backspace key (usually DEL or BS)
|
|
ESCKEY ASCII code for Escape/Abort key (usually ESC)
|
|
NULKEY Returned if no Key was Pressed
|
|
RTNKEY ASCII code for Return/Enter key (usually CR)
|