On Mon, Jun 4, 2018 at 5:13 PM, Paul Koning via cctalk <[email protected]> wrote: >> On Jun 4, 2018, at 1:17 PM, Robert Armstrong via cctalk >> <[email protected]> wrote: >> >> ... FWIW, I have a 725 complete and working. Well, except for the RC25, >> which never worked even when they were new.
I had an 11/725 in the 80s and 90s and never had a problem with the RC25 but they are legendarily terrible. > Hm. I remember some RC25s on RSTS, and they seemed to be ok. The fact that > they had two drives on one motor made it strange, especially if the fixed > platter was your system device. We had to teach the OS how to deal with SY: > going away temporarily. Oof, yeah. When I used my 725, I didn't spin the RC25 up and down except when booting and shutting down. I also had devices like RL02s for removable storage. I often wonder how hard it would be to develop some other storage device for the KELSI but then other projects push to the top of the stack and I move on. Mostly, what I need is affordable ($250 or less) Unibus storage with modern media (Flash or IDE adapter or whatever). I don't really care what form it takes but Unibus SCSI cards are quite pricey and making a new controller is even less affordable (I used to make and support DMA-enabled Unibus communication controllers for a living so I have a pretty good idea of the amount of effort required). -ethan
