brucer@gvgpsa.UUCP (Mitch Hendrickson) (07/29/87)
I am about to undertake a project and could use a little advice from some PC guru out there: I have a PCjr with 640k and provision for another drive. I would like to make this drive a 3.5" 720k disk. The device driver packaged with the system (ie memory + second drive mod) for enabling the second drive simply bumps the equipment configuration word drive count and reboots the system, to enable DOS to recognize that I have two drives. I have been thinking of two options: 1) Leave DOS thinking I only have 1 drive (ie A and B both point to the same physical drive) and write my own device driver for the 3.5". Don't worry - I have intimate experience with the controller from another project. 2) Somehow (and this is where I might need some help) patch/modify/otherwise inform DOS that drive B: is of a different format. Does anyone out there have any comments or suggestions, and especially in the case of option 2), any pointers that might help me out? AdvTHANXance, Mitch Hendrickson (...tektronix!gvgpsa!brucer)
omega@ut-ngp.UUCP (Omega.Mosley`) (07/30/87)
...some itme back, a company was advertising dial 3 1/2's in an underchassis setup for like 199 bucks, with controller. they discontinued them for 99, and according to some frineds at Big Blue Inc., here's why: ...DOS 3.2 & 3.3, for some undisclosed reason, will not let the Jr format 3 1/2 inch disks. The dual system worked fine in all other aspects, but would not format due to the DOS. ...of course, if it worked, they wouldn't have been sellling the damn disk driveassemblies for as cheap as they did. Omega.Mosley President, KSA