ADAM Disk Drive BIOS

[Mike Harris]

This is a copy of part of my blog but covers the BIOS I recovered from the Disk Drive I just picked up.

 

Anyone, please feel free to comment.

 

MAME uses AD 31 rev a 09-27-84 BIOS

Mine   uses AD 31 rev a 10-11-84 BIOS

 

Aside from date I see no difference but I have yet to do a byte compare and am lazy to do so anyway.

I see that both are Revision A, Checksum AD 31....just that they have different dates which could always be the date it was burned.

 

It is a 4k Hitachi  HN462732G Eprom

 

Other than that, nothing new.

Time to recover the 6801 internal controller code.
Lets see if I can.

 

 

UPDATE----------

Fought the laziness and checked the code.
they match byte for byte so it's just the date.
 

Being as I can screw with the BIOS I am trying to think up something that hasn't been done before but I don't see anything.
 

I think I'll just hook to an Arduino and see what happens.

Edited October 24, 2019 by Mike Harris