Date   : Mon, 11 May 1992 22:01:25 GMT
From   : usenetusenet@cs.orst.edu (Erik Petersen)
Subject: Master drive

I have just finished building a Ram Drive for my S-100.

The Ram Drive is FAST. Unfortunately, I've found a nasty 
piece of trivia about CP/M; there is a BDOS function that
resets the drive system. (0DH, I think.) It logs all the
drives out, sets the DMA to 80H, and then logs drive A
back in. Since drive A is a 5-1/4" floppy, this is slow
compared to logging in the Ram Drive.

What I would like to do is patch the BDOS so that it logs
Drive E in after reseting the drive system, does anyone know
how to do this. (I can't trace the call because DDT chokes
when you try to trace the BDOS.)

I am running CP/M 2.2.

Erik Petersen

-- 

   Erik Petersen                                (Home Phone: 753-1829)
   peterse@mist.cs.ORST.EDU