[Coco] cocoflash hardware detecting menu

[rietveld rietveld]

 I believe that Pere Serrat has a working cocoflash for the Dragon

Sent from my BlackBerry 10 smartphone.
  Original Message
From: David Ladd
Sent: Tuesday, July 3, 2018 1:31 AM
To: CoCoList for Color Computer Enthusiasts
Reply To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] cocoflash hardware detecting menu


Henry,

How hard would it be to add in Dragon support in there as well?

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On Mon, Jul 2, 2018 at 7:15 PM, rietveld rietveld <rietveldh at hotmail.com>
wrote:

> My Flash died and I am forced to re-write the menu code again since I
> wasn't smart enough to save everything .
>
> I have most files, but not all.
>
>
> Anyway i decided that there is a less complicated way to have the
> cocoflash detect the hardware that it is inserted into.
>
>
> The cocoflash boots up to a MENU program that is stored in banks0/1 of the
> flash.  I replaced this MENU with a small program that I wrote and flashed
> it into bank0/1 ; so now that program launches on power up instead of the
> MENU.
>
>
> The Hardware detecting program PEEKS for, and sets, two sets of flags
> called CC(colour computer) and BM(big memory).
>
>
> The program PEEKS(&HFFFE) .  If it returns a value of &H8C then it sets
> the CC flag to 1 to say it has found a coco3 else the flag stays at 0 to
> say you are using a COCO1/2.
>
>
> If the CC flag is set to 1 it does a GOSUB and runs a 512k memory test
> routine.  If this test fails it leaves the BM flag set to 0.  If the 512k
> test is successful then the BM flag is set to 1
>
>
> If the CC flag is set to 0 it does a GOSUB and runs a 64k memory test
> routine.   If that test fails the BM flag stays at 0 else it is set to 1 if
> the test successfuly detects 64k
>
>
> Now the easy part.  I have four seperate MENUs all based on the same
> single MENU code with only the DATA lines being changed. The MENU code
> contains a single PEEK and flag(SS) that is used to detect for the presence
> of a Speech/Sound cart. If the SS flag is set to 1 then every time a game
> is selected the name in the DATA line is sent via a GOSUB to a speech
> routine.
>
>
> The first MENU contains only programs that will run on a coco 1/2 with
> less than 64k, the second is a MENU containing all programs that will run
> on a 64k(or less) coco1/2, the third MENU shows the programs that run on a
> 128k coco3(excluding the coco2 programs that dont run on the coco3 ) and
> lastly the fourth MENU contains everything in the 3rd MENU plus any 512k
> only programs that may be flashed onto the COCOFLASH.
>
>
> The MENUS are flashed into BANKS 1000,1100,1200,1300, and are listed in
> DATA line of the Hardware detecting program flashed into Bank 0/1.  The
> MENUs are called and launched exactly as they would be if they were games
> being selected from the original MENU selection program.  So if CC flag is
> set at 1 and BM is set at 0 then the program launches the program 'MENU' in
> bank 1200.  This MENU is for the 128k coco3  .  That Menu would then PEEK
> and set the SS flag as detected.  Again if the Hardware detecting program
> see a CC flag set to 0 and a BM flag to 1 it will launch the MENU from BANK
> 1100 aas it has determaned that the COCOFLASH is plugged into a 64k COCO1/2
> .   If it were plugged into a 16k COCO it would launch the MENU located at
> BANK 1000 since the CC and BM flags would both be set to 0
>
>
> I tried to PEEK for 4k machines but as of yet have not been able to come
> up with a 16k TEST routine
>
>
>
>
>
>
>
>
>
>
>
>
>
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>

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