CP/M

<> Actually the NS* contrller and the apple one are very close in that the <> are minimalist. The NS controller can read media without index/sector < <As is the H17 - a USRT and a few TTL chips. Most of the work is done in <software. A USRT is far mor than minimalist as the NS* con troller is really just bare shift register with timing logic around it. <The H17 waits for a sector hole, waits for sync, reads a sector header (a <checksums it in software), waits for sync, reads data and checksums that Same with the NS* <Does anyone know a source of hard-sectored 5.25" disks (10 sector ones in <particular). I guess they're no longer made, alas. I have thought about <making up a jig, dismantling a soft-sectored disk, punching the extra <holes and putting the disk back in the jacket. Problem is resealing the <edge of the jacket which I've opened. Or doing it insitu using a old drive as a positioner. Allison