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102 lines
4.3 KiB
Plaintext
102 lines
4.3 KiB
Plaintext
System Specific Header File Specification
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The very first directive of the program must be
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#include <header.h02>
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where header.h02 is the system specific header file, (e.g. apple1.h02,
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vic20.h02, etc.).
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Note: This will probably be replaced with a command line parameter
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(e.g. '-s apple1', '-s vic20', etc...) to allow program portability.
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For compatability with the C02 Standard Library, the following functions
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must be defined
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c = plkey(); Polls keyboard and returns raw ASCII character
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corresponding to last/current pressed key.
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Returns constant NULKEY (usually 0) if no key was
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pressed.
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c = rdkey(); Waits for a keypress and returns the raw ASCII
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character corresponding to the pressed key.
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Note: Usually a loop that calls plkey(), but may
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also directly call a system subroutine.
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c = getkey(); Waits for a keypress and returns the cleaned
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ASCII value corresponding to the pressed key.
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Note: Calls rdkey() followed by any necessary
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character code conversions. This can be due to
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high-bit being set by keyboard decoder,
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non-standard key mappings, keys that generate
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escape sequences, etc...
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newlin(); Advances the cursor to the beginning of then
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next line.
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Note: Depending on the system, this will usually
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output a Carriage Return, Line Feed, both.
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prchr(c); Writes character c to the screen.
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Note: May directly access memory-mapped I/O
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or may call a system subroutine.
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r = getstr(&s); Reads a maximum of 128 characters from keyboard
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until a carriage return is received, storing the
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entered characters as null-terminated string s.
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Allows corrections using Backspace/Delete.
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Pressing the Escape/Abort key terminates entry,
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leaving the string in an undefined state.
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Returns number of characters entered, or 255
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if entry was aborted.
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r = outstr(n, &s): Writes up to 128 characters of null-terminated
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string s to the screen, starting at position n.
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Returns position of null terminator in string.
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r = putstr(&s): Writes up to 128 characters of null-terminated
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string s to the screen and advances the cursor to
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the beginning of the next line.
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Returns number of characters printed.
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Note: Calls putstr(0, &s) followed by newlin().
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along with the Zero Page locations (each pair of which must be sequential)
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strlo, strhi String Pointer for stdio.asm and string.asm
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srclo, rcshi Secondary String Pointer for string.asm
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the following locations that may be Zero Page, but don't have to before
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temp0, temp1 Temporary variables used by stdlib.asm
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and the following locations that must be preserved between function calls
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random Storage for the Random Number Generator
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Contains the last number generated and is used to
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generate the next number in the sequence
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rdseed Seed for Pseudo-Random Number Generator
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Usually a counter or timer. If one is not provided
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by the system, should be generated by incrementing
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in the plkey(), rdkey() functions.
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and the constants
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DELKEY ASCII code for Delete/Backspace key (usually DEL or BS)
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ESCKEY ASCII code for Escape/Abort key (usually ESC)
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NULKEY Returned if no Key was Pressed
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RTNKEY ASCII code for Return/Enter key (usually CR)
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