4 Feb
2015
4 Feb
'15
2:50 p.m.
According to my documentation, there are two programmable signals
brought out on the 34-pin headers as well as the 37 pin D-sub.
Pin 2 on the 34-pin is connected to pin 3 (note D-sub numbering
conventions as contrasted with 0.10" header conventions) on the DC37
connector. Pin 6 on the 34-pin header is connected to pin 5 on the DC37.
2 is specified as "Mode 1", which is normally used as a density-select
on 5.25" drives, but is used as a RWC signal on 8" drives. Pin 6 is
specified as "Mode 2", which is NC on the 8-inch cabling. Normally, pin
6 is used to control 2.88M or 3-mode drives.
--Chuck
On 02/04/2015 01:45 PM, Mike Stein wrote:
Is TG43 available on both the internal 34-pin and the
external DC(DB)-37
connector on the CompatiCard? Some old posts suggest that it's only
output externally, but the CC manual seems to treat both internal and
external connections to an 8" drive equally valid.
m
----- Original Message ----- From: "Chuck Guzis" <cclist at sydex.com>
To: <General at classiccmp.org>; "Discussion at classiccmp.org:On-Topic and
Off-Topic Posts" <cctalk at classiccmp.org>
Sent: Wednesday, February 04, 2015 3:32 PM
Subject: Re: ISA ( PC ) 8" floppy disk CONTROLLER ???
TG43 is also sometimes called "RWC" for
reduced write current. On
many later 8" drives, this is a NC.
--Chuck
On 02/04/2015 10:58 AM, Ali wrote:
> So
are you saying that with a CC IV you don't need the DBIT adapter,
> for writing, and just need the 34pin to 50pin converter?
Yup. The wiring of the 34-to-50 position connector is also documented
in the CC manual.
Chuck,
I've seen the wiring info in the manual and I just looked through the
PDF
version of the manual I have. I could not find any mention of TG43 in my
quick look through. Do you by any chance know where the info is? Thanks.
-Ali