25 Dec
2000
25 Dec
'00
4:30 a.m.
On Dec 24, 23:41, David Gesswein wrote:
Useful to know - thanks!
It might take a while to find a working permutation of PC/controller, but
that might be a viable solution for me.
From:
pete(a)dunnington.u-net.com (Pete Turnbull)
I tried booting the VT78
from a RX02 in RX28 mode and it worked with a RX02 version of OS/8. >Well, before I go that far, I might try to get
8" drives running on an
old
PC that has an
XT controler which *should* do SD, I think. Can I use
something like PUTR to create a disk that way?
I think so if the floppy chip supports SD. I have not tried. This is the pinout I got by buzzing out the adapter
cable I made to go
from the DB25 on my RX02 to the 40 pin cable from the RX8E.
If the pinout was in a document I can't find it, I may of
gotten the pinout by buzzing out the cable in the drive.
Pins 10,11,23, and 24 are not connected in the cable from my VT78 but
pin 25 is present. I don't remember why my adapter cable has
extra pins connected.
DB25 40 pin header
1 3 C
14 4 D
2 7 E
15 8 F
Um, by your numbering scheme, 7 and 8 are H and J, not E and F.
10 37 SS
23 38 TT
11 39 UU
24 40 VV
12,13,25 Not connected.
TT is DRV AC L and VV is RX DMA INTR L. These are the extra connections
used by RX211 and RXV21 controllers, and I expect RX28 also uses RX DMA
INTR L.
40 pin connector is numbered
1 (A) 39 (UU)
2 (B) 40 (VV)
ObNitpick: That's the reverse of the conventional numbering; Berg
connectors with letters have the red stripe at the A end, which is on the
left of the pin header (looking into the pins) while all other headers
which are numbered have pin 1 on the right.
Merry Christmas!
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York