On 3/13/20 7:56 PM, James Zeun wrote:
You know what, it's very tempting as I find soldering very cathartic.
But the cable is ordered now.
I'm gutted the DVI writes floppys in a different format to the TPDD.
Curse you Tandy!
It's really the TPDD that is weird. It's not just a different data
layout, it's a different magnetic signal. The TPDD drive really was just
meant for the knitting machines first, which didn't need to try to
adhere to any kind of interoperability standard beyond the physical
media. But the hardware was cheap and the connection was ttl serial, and
the protocol was easy, and so I guess it was irresistable to try to doll
it up into a storage device for the M100's because anything was better
than the cassettes.
But DVI is, not standard, but at least almost standard, or more
standard. At least normal drives and drive controllers (old ones anyway)
can at least read the tracks in the normal way without Kryoflux.
On Fri, 13 Mar 2020, 6:16 pm Brian K. White, <b.kenyo...@gmail.com
<mailto:b.kenyo...@gmail.com>> wrote:
On 3/13/20 5:15 AM, James Zeun wrote:
> Well of course I knew I could buy a £4 cable and save myself half an
> hour soldering 40 wires, well 80! What do you take me for some
sort of
> idiot? *Cough* :-P
>
> There's always someone with a bright idea. Well I'm going to make
coffee
> and try to not feel too disappointed about all that soldering I'm
> missing out on, now I have a 30cm extension cable ordered.
>
> *Goes off grumbling to himself*
>
> Thanks Brian! ;-)
Someone else said splice you didn't, but in this same conversation,
so I
just addressed it all in one post.
Are you *sure* you don't want to perform 80 solder and heat-shrink
splices? It can be very zen. :)
--
bkw
> On Fri, 13 Mar 2020, 5:34 am Brian White, <b.kenyo...@gmail.com
<mailto:b.kenyo...@gmail.com>
> <mailto:b.kenyo...@gmail.com <mailto:b.kenyo...@gmail.com>>> wrote:
>
> It's easier than that. If you take pretty much any idc
connector and
> put it back to back or hed yo head with another, the end
result is
> the "twist" where pin 1 switches places with pin 40, pin 2
switches
> places with pin 39, etc.
>
> What I mean by "any idc" is, for instance, a wire-to-board
back to
> back with a male pin header. That makes a Model 102 or 200 cable.
>
>
http://tandy.wiki/Disk/Video_Interface:_Cable#Cable_supporting_models_102_and_200_only
>
> Another form of the same thing is if you put 2 male pin
headers back
> to back, that makes an adapter that can serve as the the
twisty part
> on a cable set that works on all 3 models.
>
> http://tandy.wiki/Disk/Video_Interface:_Cable
>
> Or head to head: Mike Stein showed me (well everyone) that if you
> just take any standard 40 pin cables and butt two female ends
face
> to face with a "gender changer" pin header, that results in
the same
> twist.
>
> That page above has links to buy all the odd parts for the
different
> ways to do it.
>
> But for a pcb to do the switcheroo, the pcb is nothing more
than 40
> straight lines just to make it easier to solder two plugs back to
> back. See the "twist adapter" link in that page.
>
> You don't have to splice anything to make the cable longer.
Just buy
> or make a bog-standard 40 pin male-female extension cable,
and stick
> it on the DVI end of the cable. They are readily available
pre-made
> and cheap these days in the form of "gpio" cables for arduino or
> raspberry pi.
>
> You can search "male female gpio" or similar on ebay or just
pick a
> length here:
>
> http://www.cablesonline.com/240pinidedir.html
>
> --
> bkw
>
> On Thu, Mar 12, 2020, 5:33 PM RETRO Innovations
> <go4re...@go4retro.com <mailto:go4re...@go4retro.com>
<mailto:go4re...@go4retro.com <mailto:go4re...@go4retro.com>>> wrote:
>
> On 3/12/2020 4:17 PM, Mike Stein wrote:
>>
>> Hi Jim,
>> I wouldn't call it a newbie mistake ;-) Those 'non-standard'
>> 40-pin DIP headers have been impossible to find; maybe with
>> your resources you can find some somewhere so they can just
>> simply be crimped on.
>
> I'm wondering if the switch could be made at the other
end, with
> a small PCB and the respective female header attached to
it...
>
>
--
bkw
--
bkw
