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Brief update for those who do not follow my page.


Captain Cozmos

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I have reached out to David Schroeder for a solution to work on Dino Eggs, I do not want to disturb him over the holidays so I do not expect much correspondence.
Hopefully something can be worked out that will benefit everyone.

I began my disassembly for the DDP 6801.
It is my intention to come up with a replacement for it, incorporate it into the ADAM FPGA Core for the phoenix or other systems.
Again, it is my intention to make it better, compatible and introduce a new command to format the DDP drives.  Also for whomever that adopts my DOS/System replacement so everyone wins.

Here is the first routine when accessed with the 6801 just for goofs.
When I clean up the code I will post the whole thing.

I disassembled the DDP 6801 code and boy do I have to brush up on my 6801.
 

ok, the first routine from ground zero:

JSR sub_F9BC

 

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 sub_F9BC  ; first routine performed by the 6801 for the Digital Data Drive

                sec
                ldab    <$11
                ldaa    <$12
                andb    #$40
                beq     sub_F9C7
                clc
                rts

 

sub_F9C7:
                ldab    <$97
                bne     subret_F9D7
                tab
                anda    #$F
                cmpa    #8
                bne     sub_F9D6
                tba
                sec
                bra     subret_F9D7

 

sub_F9D6:
                clc

subret_F9D7:
                rts

 

 

 

 

Flow.thumb.png.bb9c7a73257f3bcd72cede88ad7f3589.png

 

More to follow later.

 

CC

Edited by Captain Cozmos
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