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makefile: Allow PORTS with level1/2 mix https://sourceforge.net/p/nitros9/feature-requests/10/
author Tormod Volden <debian.tormod@gmail.com>
date Tue, 19 Apr 2022 18:12:17 +0200
parents 03f26e88b809
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****************************************

* Convert hex byte to 2 hex digits

* OTHER MODULES REQUIRED: none

* ENTRY: B= value to convert

* EXIT: D=2 byte hex digits


 nam Convert Byte to Hex
 ttl Assembler Library Module

 section .text

BIN2HEX:
 pshs b
 lsrb get msn
 lsrb
 lsrb
 lsrb fall through to convert msn and return
 bsr ToHex
 tfr b,a 1st digit in A
 puls b get lsn
 andb #%00001111 keep msn

ToHex
 addb #'0 convert to ascii
 cmpb #'9
 bls ToHex1
 addb #7 convert plus 9 to A..F
ToHex1
 rts

 endsect