How to resolve the algorithm Generate lower case ASCII alphabet step by step in the 8080 Assembly programming language

Published on 12 May 2024 09:40 PM
#8080 assembly

How to resolve the algorithm Generate lower case ASCII alphabet step by step in the 8080 Assembly programming language

Table of Contents

Problem Statement

Generate an array, list, lazy sequence, or even an indexable string of all the lower case ASCII characters, from a to z. If the standard library contains such a sequence, show how to access it, but don't fail to show how to generate a similar sequence. For this basic task use a reliable style of coding, a style fit for a very large program, and use strong typing if available. It's bug prone to enumerate all the lowercase characters manually in the code. During code review it's not immediate obvious to spot the bug in a Tcl line like this contained in a page of code:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Generate lower case ASCII alphabet step by step in the 8080 Assembly programming language

Source code in the 8080 programming language

	org	100h
	jmp	test

	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	;; Store the lowercase alphabet as a CP/M string
	;; ($-terminated), starting at HL.
	;; Destroys: b, c
	
alph:	lxi	b,611ah	; set B='a' and C=26 (counter)
aloop:	mov	m,b	; store letter in memory
	inr	b	; next letter
	inx	h	; next memory position
	dcr	c	; one fewer letter left
	jnz	aloop	; go do the next letter if there is one
	mvi	m,'$'	; terminate the string
	ret 
	
	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	;; Test code
test:	lxi	h,buf	; select buffer
	call	alph	; generate alphabet
	
	lxi	d,buf	; print string in buffer
	mvi	c,9
	call	5 
	rst	0


buf:	ds	27	; buffer to keep the alphabet in

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