Re: fried disk][ controller - any hope ?

[Wouter de Waal <bofhdec98@ccii.co.za>]

Hi all

> **  one card, whips dating spring 1982 (came with the ][e) reads &
> wirtes disks just fine, but it never stops the drivemotors spinning.
> When I boot Dos3.3 in drive 1, the light stays on, and the disk spins
> perpetually. Then, if i access drive 2 on the card, it stops drive 1,
> and starts drive 2, (and reads&wirtes just fine), and thene never turns
> drive 2 off. What could cause this, and can it be fixed ?
> 
> ** the other "problem" card simply doesnt spin up the drives at all. i t
> doenst prevent booting the computer; i can reset it into basic, but it
> doenst spin the drives..  this one is a really old one (13 sectors,
> judging from the IC numbers

All of the chips except for the roms are common off-the-shelf
74 types. Also 556 dual timer. I can't remember, will have to
look, the disk on time might be controlled by the 556. Swap
the chips (start by swapping all, then swap the old ones in
one by one) off a working card. It's only 8 chips or so after all :-)

Same for the card that doesn't work at all. (I've done the
chip swap thing for a whole motherboard, now *that's* fun.
So is chucking in a spare 74xx chip and watching the people's
faces when you have a chip left over after the rebuild :-)

W