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Comment by _lce0 | Hacker News Reader

looks like there is a PHP intruction.

    TABER: PHP			;REMEMBER IF SPC OR TAB FUNCTION.
	   JSR	GTBYTC		;GET VALUE INTO ACCX.
	   CMPI	41
	   BNE	SNERR4

also it appears right in the middle

    FRETMP: STWD	INDEX		;GET LENGTH FOR LATER.
	    JSR		FRETMS		;FREE UP THE TEMPORARY DESC.
	    PHP				;SAVE CODES.
	    LDYI	0		;PREP TO GET STUFF.
	    LDADY	INDEX		;GET COUNT AND

http://www.obelisk.demon.co.uk/6502/reference.html#PHP

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Here's a nice overview of all the 6502 instructions: http://www.obelisk.demon.co.uk/6502/instructions.html

Did you try searching for "6502 php"? The first hit would have given you a pretty good overview of its operation. Assembler mnemonics are usually unsearchable without including the architecture in the query.

Push processor status (so saves processor flags on stack)

Push the processor status onto the stack.

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