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Program location

Defaults to $801 for ROM-based Applesoft. Locations $67/$68 point to the start of the program, and the byte preceding it must be #0.

Details:

• http://www.atarimagazines.com/compute/issue11/36_1_THE_APPLE_GAZETTE_RESOLVING_APPLESOFT_AND_HIRES_GRAPHICS_MEMORY_CONFLICTS.php
• http://retrocomputing.stackexchange.com/questions/1604

Format

DOS stores an additional byte on the end, which should be ignored.

Parsing

See PARSE.INPUT.LINE at http://www.txbobsc.com/scsc/scdocumentor/D52C.html

“AT” is ambiguous: it could also be “ATN” or “A TO”. Applesoft checks by seeing if the character directly after “AT” is “N” OR “O”, and forcing a non-match with “AT” if so. Note that this doesn’t skip blanks.

Data statements and REM statements seem to leave characters completely intact (including storing the space, if any, after the “REM” or “DATA” keyword).

ProDOS and SOS File Types

Beneath Apple ProDOS Table E.1

00		both	Typeless file
01		both	Bad blocks file
02		SOS	PASCAL code file
03		SOS	PASCAL text file
04	TXT	both	ASCII text fil
05		SOS	PASCAL text file
06	BIN	both	Binary file
07		SOS	Font file
08		SOS	Graphics screen file
09		SOS	Business BASIC program file
0A		SOS	Business BASIC data file
0B		SOS	Word processor file
0C		SOS	SOS system file
0D-0E		SOS	SOS reserved for future use
0F	DIR	both	Directory file
10		SOS	RPS data file
11		SOS	RPS index file
12-18		SOS	SOS reserved for future use
19	ADB	ProDOS	AppleWorks data base file
1A	AWP	ProDOS	AppleWorks word processing file
1B	ASP	ProDOS	AppleWorks spreadsheet file
1C-BF		SOS	SOS reserved for future use
C0-EE		ProDOS	ProDOS reserved for future use
EF	PAS	ProDOS	ProDOS PASCAL file
F0	CMD	ProDOS	Added command file
F1-F8		ProDOS	ProDOS user defined file types
FA	INT	ProDOS	Integer BASIC program file
FB	IVR	ProDOS	Integer BASIC variables file
FC	BAS	ProDOS	Applesoft BASIC program file
FD	VAR	ProDOS	Applesoft BASIC variables file
FE	REL	ProDOS	EDASM relocatable object module file
FF	SYS	ProDOS	System file

NakedOS FHELLO + FWORLD

This is the simplest possible example of a FHELLO program that loads another program (FWORLD) at $6000, then jumps to it. The placeholder FWORLD below clears the screen, prints “HELLO WORLD”, then spins forever.

FHELLO

20 40 03 JSR NAKEDOS 6D 01 DC ADC NKRDFILE 2C 02 DF BIT ${filename} 2C 00 60 BIT ${target page} F8 CLD 4C 00 60 JMP ${target page}

FWORLD

6000-G 20 58 FC JSR HOME 6003-H A2 00 LDX #00 6005-I BD 13 60 LDA -O,X 6008-J F0 06 BEQ -N 600A-K 20 ED FD JSR COUT 600D-L E8 INX 600E-M D0 F5 BNE -I 6010-N 4C 10 60 JMP * 6013- C8 C5 CC CC CF HELLO 6018- AC A0 D7 CF D2 CC C4 00 , WORLD.

diskii commands

echo -n -e ‘\x20\x40\x03\x6D\x01\xDC\x2C\x02\xDF\x2C\x00\x60\xF8\x4C\x00\x60’ | diskii put -f ./lib/supermon/testdata/chacha20.dsk DF01:FHELLO - echo -n -e ‘\x20\x58\xFC\xA2\x00\xBD\x13\x60\xF0\x06\x20\xED\xFD\xE8\xD0\xF5\x4C\x10\x60\xC8\xC5\xCC\xCC\xCF\xAC\xA0\xD7\xCF\xD2\xCC\xC4\x00’ | diskii put -f ./lib/supermon/testdata/chacha20.dsk DF02:FWORLD -

Sources

ProDOS

ProDOS boot source