Re: ProDOS / Autostart ROM ID bytes

["David Wilson" <mcs6502@gmail.com>]

vladitx wrote:
> Trying to understand Alex Freed's PD8, I found this at the beginning of
> the boot firmware code:
>
> ;; $Cx00
>         ldx     #$20    ; ID bytes for ProDOS and the
>         lda     #$00    ; Apple Autostart ROM
>         cpx     #$03    ;
>         cpx     #$3C    ; this one for older II's
>
> Does someone remember the exact and full requirements to be:
>   - recognized by Autostart ROM on ][+, //e, //c, etc.
>   - recognized by ProDOS as a block device driver

Required by the AutoStart ROM in Apple ][+ & un-enhanced IIe:

Cn00: xx 20 xx 00 xx 03 xx 3c

Required by the enhanced IIe and IIgs (and ProDOS):

Cn00: xx 20 xx 00 xx 03

SmartPort:

Cn00: xx 20 xx 00 xx 03 xx 00

> Regarding ProDOS driver structure, is there public document describing
> all requirements like entry points, etc.? Example source template will
> be appreciated.

There should be - I don't have my ProDOS Technical Reference manual to
hand.

CnFE is the ProDOS block interface status byte which indicates the
capabilities of the card (1-4 drives, read/write/status/format commands
supported, interrupts supported).
CnFF is the offset from Cn00 for the entry point of the ProDOS block
interface

Parameters are passed in ZP locations $42-46 I seem to recall.