Convert number in ascii to hex value

[unartic]

Hi!

If I have these bytes: $32 $36 $30 $31 which represent the value 2601.

How can I convert it to the corresponding hex value: $0A29

[ahenry3068]

What language are you using ?

[unartic]

Assembly ca65

[ahenry3068]

In BASIC You use VAL(String$)

So A= VAL("2601")

Then in Numeric format 2601 and your Hex value are the same.

To represent it as HEX again you would use HEX$(A)

[ahenry3068]

Assembly ca65

I think theirs a ROM routine, let me look.

[ahenry3068]

I couldn't find one .. I think you need to get on Discord and ask this question in ASM-DEV. I really don't know enough about assembly yet to help. I know how its done in High level language. I was hoping I could find a ROM call for you.

[Stefan]

I’ve based such code on this old article:

https://www.atarimagazines.com/compute/ ... OUTINE.php

[Stefan]

An example based on the above article:

https://github.com/stefan-b-jakobsson/x ... r/util.inc

The function util_str_to_bcd converts a NULL terminated ASCII/PETSCII string to Binary Coded Decimal format.

And the function util_bcd_to_bin converts a BCD value to a binary number that the 65c02 can use