No subject

Old interfaces (removable unless noted)
=======================================

disk	cap.	sec/trk	trk/cyl	cyl	notes
================ via PDP-11 RK-11, PDP-8 RK8

RK02	1.2M	12	2	203	Diablo model 30 low density (256B sect)
					avg seek: 70ms (15ms min)
					1500 rpm; avg rot delay: 20ms
					xfer: 22.2us/word
					1100 BPI max
RK03	2.5M	12	2	203	Diablo model 30 high density (512B sect)
					avg seek: 70ms (15ms min)
					1500 rpm; avg rot delay: 20ms
					xfer: 11.1us/word
					2200 BPI max
RK05(J)	2.5M	12	2	203	1500rpm; RK03 cartridge;
					RK8 max xfer 1.44Mb/s (8.32us/wd 1.1??)
					seek: 50ms/10ms/85ms
RK05F	5M	12	2	203	1500rpm; fixed rk05; 2xRK05 to s/w

================

RK06	13M	22	3	411	2400rpm; dec built
RK07	27M	22	3	823	2400rpm; dec built;
					xfer 538KB/s; lat=12.5ms
					seek: 36.5ms avg, 8.5ms min
					avg access 49ms


Massbus
=======
disk	cap.	sec/trk	trk/cyl	cyl	notes
RM02	67M	32	5	823	pack; CDC 9762; 2400 rpm
					xfer=6.4Mb/s (806KB/s); avg acc 42.5ms
					seek 30ms (avg), 6ms (min)
					avg latency 12.5ms
RM03	67M	32	5	823	pack; CDC 9762; 3600 rpm
					xfer=9.6Mb/s (1.2MB/s); avg acc 38.3ms
					seek 30ms (avg), 6ms (min)
					avg latency 8.3ms

RM05	256M	32	19	823	pack; CDC 9766
RM06	?

>You can use an RM05 with an 11/750, but it's possible that the packs
>in question were also used with a PDP-11.  Knowing a little about the
>source might help extraction (although sticking an RM05/9766 on a
>suitably equipped VAX under UNIX and using 'dd' could get you a disk
>image file).

BUT, can you use it if the RM05 was written on a 36-bit PDP-10 system?  On a positive note, after doing some looking it seems most likely that the data was written on either a PDP-11/70 or a VAX.

The idea of getting a disk image of the disks is probably the best, and it can be done with more than just a VAX running UNIX, it can also be done using VMS, and can also be done on a PDP-11.  It looks like SIMH supports RM05's, so it would be a simple matter of booting the right OS in SIMH, and reading the data that way.  Getting data out of SIMH would be tricky, but not impossible.

				Zane


-- 
--
| Zane H. Healy                    | UNIX Systems Administrator |
| healyzh at aracnet.com (primary)    | OpenVMS Enthusiast         |
|                                  | Classic Computer Collector |
+----------------------------------+----------------------------+
|     Empire of the Petal Throne and Traveller Role Playing,    |
|          PDP-10 Emulation and Zane's Computer Museum.         |
|                http://www.aracnet.com/~healyzh/               |