Re: Where does the "16 SECTOR" message come from?

["sicklittlemonkey" <Nick.Westgate@gmail.com>]

On Feb 20, 6:52 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:
> The slot ROM (256 bytes) clearly reads the disk to determine whether
> it is a 13-sector format or a 16-sector format, but the $C800 space
> deosn't appear to belong to the disk controller.

In fact, it looks like it's the slot code that's bank switched via a
store to $CX80. This should make it easier to dump. It detects the
disk type, and then stores this code at $800:

800: LDA #$02 (#$03) ; bank number?
802: STA $CX80 ; select bank
805: LDA #$00
807: JMP $CX52 ($CX53) ; print "16 (13) SECTOR"? ... ;-)

The values in parentheses are for 13 sector disks.

Tristan, the slot ROM dump looks damaged. It isn't really all zeroes
after offset EB is it? The code crashes as it is.

Cheers,
Nick.