me128-aw@kepler.Berkeley.EDU (me128 student) (12/20/88)
I did the Chris Erving memory hack which appeared in Amazing computing quite some time ago, and now it's giving me problems. In order to keep the slow mem from auto-configuring, the board in the hack disables the memory on reset and doesn't engage it until the light in df0: goes on. The problem is; when I boot from rad: it NEVER goes on! I really don't want to open my machine again to have to fix this, so I just need a question answered so I can do it in software: How do I flash the drive light in df0: if there's no disk in there? Can somebody give me a 'c' code fragment to do this? -thanks -Vincent H. Lee
lee@sed170.HAC.COM (John Lee ) (12/22/88)
In article <27180@ucbvax.BERKELEY.EDU> me128-aw@kepler.Berkeley.EDU (me128 student) writes: >I did the Chris Erving memory hack which appeared in Amazing computing quite >some time ago, and now it's giving me problems. In order to keep the slow >mem from auto-configuring, the board in the hack disables the memory on >reset and doesn't engage it until the light in df0: goes on. The problem >is; when I boot from rad: it NEVER goes on! > >I really don't want to open my machine again to have to fix this, so I >just need a question answered so I can do it in software: > >How do I flash the drive light in df0: if there's no disk in there? Can >somebody give me a 'c' code fragment to do this? > >-thanks >-Vincent H. Lee In order to flash the drive light, you simply need to turn df0:'s motor on temporarily. Now as to how to do that, you'll need the small code fragment posted here a while back to first disable the drive (i.e., make it busy and take it out of AmigaDOS's hands), then select the drive, toggle the motor control, deselect the drive (trackdisk device?), and then release the drive. Another possiblity is to toggle the drive motor by going to hardware directly, after properly getting the disk resource, of course (since this is a machine- specific problem, specifically your machine, we won't worry about going to HW directly, right? :-) Now, I did the hack for a friend a while ago, but I don't quite recall why the anti-auto-config hack was needed. Is it still necessary? Don't B2000's come with $80000 slow memory that auto-configs just fine? ------------------------------------------------------------------------------- Raining CATS and DOGS? Join the RATS: Remote Amiga Teleconferencing System +--------+ John Lee | HUGHES | +--------+ ARPAnet: jhlee@hac2arpa.hac.com Hughes Aircraft Company The above opinions are those of the user and not of those of this machine.