Intel MCS-80/85 Has the entire, JNZ search, Return, Clear HL, Move SP to HL, Save sP, To SP, Loop

For an example with N = 256, CC = .32 f.Lsec at 3.125 MHz; Byte time = 6.7 f.Lsec. A match search routine with minimum memory usage is given below:

Search Cmp M	compare byte
RZ	return if match
INX H	else increment pointer
OCR C	has the entire
JNZ search	block been searched?
STC	If so set no match flag
RET	and return.

In this application, a user may want to have several tempera- ture ranges which can be swapped in and out with a block move subroutine. Similar code can be developed for this as shown below for a 4 byte move group:

BLKMV	LXI H, OOOH	clear HL
	DAD SP	move SP to HL
	SHLD SAVESP	save sP
	MOV H, B	move Block move
	MOV L, C	Source address
	SPHL	To SP
	XCHG	Move Block move
		address to HL
Loop	POPB	fetch four bytes from
	POP 0	source store 1st byte
	MOV M, C	at destination
	INX H
	MOV M, B	2nd
	INX H
	MOV M, E	3rd
	INX H
	MOV M. 0	4th
	INX H
	OCR A	check for end of
	JNZ Loop	Block move
	LHLD SAVESP	return old
	SPHL	SP
	RET	return

Once the count less than match is found in the application the HL register has 10 added to it which points it at the corre- sponding temperature (lines 79-82). This temperature is then displayed in the address field of the SDK 85 display using user available monitor routines. If the temperature is out of range the code detects it (lines 69-74) and outputs 1'son Port A or Port B if the temperature was too low or too high respec- tively (lines 101-105 "too low" and lines 108-112 "too high").

A1-31