Jonathan Chapman via cctalk wrote:
1. I have read that the card and the drives were compatible with the dec rx02
drives. Why would the CRDS even bother to redesign a card where DEC had
perfectly good working ones? Anyone know if there is any value in keeping the
FC-202 or just keep with the DEC cards?
A lot of the third-party controllers could talk to Shugart-style 8" floppy
drives. They can also usually *format* the diskettes, which the RX01/RX02 systems
from DEC can't do -- you have to use preformatted media. This isn't a *huge* deal
since RX01 is just IBM 3740 and you can format it on CP/M boxes, with ImageDisk,
etc. There's an XXDP utility to upconvert RX01 media to RX02, which is M2FM and very
few things can work with it.
Apparently a lot of small shops kept a CP/M box just for the task, the Alspa
ACI-2 I had was supposedly used like that.
2. Any idea on that other card?
https://w2hx.com/?prefix=x/What-Is-It/PDP-11-Thing/Board1/
Looks like a non-DEC Qniverter -- QBus to Unibus converter. If that's what it
is, you'd plug your Unibus cable into that pair of connectors on top and run it
to whatever Unibus device you were wanting to talk to, potentially another
backplane full of Unibus stuff. Commonish upgrade on e.g. CNC machines that
were originally controlled by a PDP-11/05 or something in one Unibus chassis,
with another Unibus chassis full of machine-specific cards.
Thanks,
Jonathan
.
I spy two AM2901 4-bit slice ALUs, two N82S181 1024x8 PROMs, three
AM2911 microprogram sequencers, and an SN74150 3-to-8 line decoder. This
thing is doing arithmetic.
Carlos.
