23 Jan
2012
23 Jan
'12
6:16 p.m.
On Jan 23, 2012, at 8:53 PM, Glen Slick wrote:
On Mon, Jan 23, 2012 at 4:57 PM, David Riley
<fraveydank at gmail.com> wrote:
Yes, in fact I'm pretty sure I got the image files from you. :-)
Last thing: does anyone know the difference between the A7A ROM and the A8? I've not
found anything different; I assume it's probably an obscure bugfix.
On my CQD-220/TM with original CMD labeled EPROMs I have F220Y1A8 /
F220Y2A8. Is that the same A8 version to which you refer? I wonder what is different between the A8 and B2A and
B3 versions. I
don't think I have ever tried loading the B2A or B3 versions on my
CQD-220/TM.
Not a clue. The locations aren't identical on the A8 rev, but they're very close
(within a few lines worth, say about 20 bytes). The reset vector code at 0xFFFF0 does a
bit more initialization than the A7A version as well (the A7A just does a "jmp
0xF000:0x0200", the A8 zeroes two memory locations). I don't have the need to
examine it further, so I probably won't, but if anyone has any idea, it might satisfy
my curiosity.
- Dave