search

shawty / BBCB_DFS_Catalog

A HTML based mini application, written in JavaScript to allow you to host BBC B Disk images on a website.
The Unlicense
3 stars 2 forks source link

Incorrect disassembly of 0xB1 LDA (zp),Y #8

Open fivemack opened 3 years ago

fivemack commented 3 years ago

EG at offset 0x4519 in http://bbcmicro.co.uk/explore.php?id=30

we have

4519 b1 72 91 LDA (&9172,Y)

where the disassembly should have been

4519 b1 72 LDA (&72),Y

So it's a two-byte not a three-byte instruction and the rest of the disassembly goes off alignment.

I think you have the same issue with &91 STA (zp),Y and indeed with all instructions with bottom 5 bits b10001.

The Web disassembly view is really handy but this issue makes it much less usable.

shawty commented 3 years ago

Hi @fivemack ,

I have a re-write of all of this in progress (I really need to get my backside in gear)

The disassembly stuff was actually added after I wrote the original disk lister, but work and everything else keeps getting in the way.

Thanks for noting this here, it keeps it where I can find it when I do get to doing some work on the new version.

Things have been really slow on this project unfortunately.