Labels

Labels in SPASM are much like TASM 3.2. The preferred style of label is the colon terminated, like this:

label:
	ld a,30
	ret

With labels, you can use this syntax:

label:	ld a,25 \ ret

Also permitted is the non-colon terminated line label.

label
	xor a
	ld (ram_loc), a
	ret

Like above, the following is acceptable:

label2	inc a
	ld (ram_loc+1),a
	ret 

Arithmetic

SPASM uses no-questions-asked order of operations: left-to-right. This is prefered for speed reasons as well as ambiguity between operators -- who really knows which of these operators should come first? % or &?

The operators available are as follows: * / - + % ^ & | << >>

 ld a,10*15		;= 150  multiply
 ld b,254/12		;= 12   integer divide (it truncates)
 ld c,10-30		;= -20  subtract
 ld d,-(10-23)		;= 13   negate
 ld e,10+10		;= 20   addition
 ld h,10^3		;= 9    bitwise exclusive or
 ld l,17 & 1		;= 1    bitwise and
 .db 10 | 5		;= 15   bitwise or
 .dw 1<<4		;= 16   arithmetic left shift
 ld hl,16>>4		;= 1    arithmetic right shift

Example of order of operations:

 ld hl,25*256+10	;h = 25, l = 10
 ld hl,10+25*256	;h = 350,l = 0
 ld hl,10+(25*256)	;h = 25, l = 10