Question re: GPL DSRLNK

[Willie1914]

Hi everyone,

 

I'm using the Warren/Miller General Purpose DSRLNK, and am trying to find out where the following values may be found after a successful call (for example, opening a file for read access from DSK2., etc., )?  

 

1. Card CRU address 

2. DSR address

 

I know where these values are stored when using the Ti-DSRLNK (both for MiniMem and E/A), but I'm having trouble deciphering the GPL code.

 

Thanks in advance,

Willie

[+Lee Stewart]

6 hours ago, Willie1914 said:

1. Card CRU address 

2. DSR address

 

If I understand your question, they are the same as the E/A DSRLNK:

1. Card CRU address:   >83D0
2. DSR address:  >83D2 (as with the E/A DSRLNK, this contains the address 2 bytes before the last subroutine actually called)

The code that actually finds/saves the above 2 addresses and executes the appropriate DSR subroutine is in the console ROM, which was called by the GPL DSRLNK routine in console GROM 0, which was called by the Warren/Miller DSRLNK.

 

...lee

[Willie1914]

Thanks, Lee.

 

Those two addresses (>83D0 and >83D2) are exactly what I was looking for... I had assumed that they that they were the same, but wanted to be certain.  

 

Willie

[apersson850]

Just be careful so that you don't assume characteristics in the caller, which will spoil your driver if it's called in a different way.

There are examples of when such assumptions failed.