[vcf-midatlantic] Robots and Relays and Commodore

Chris Fala chrisjpf33 at gmail.com
Wed May 25 15:16:05 EDT 2016


On Wed, May 25, 2016 at 2:56 PM, Dan Roganti via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> On Wed, May 25, 2016 at 1:47 PM, Chris Fala via vcf-midatlantic <
> vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
>
> > On Wed, May 25, 2016 at 12:58 PM, Dan Roganti via vcf-midatlantic <
> > vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> >
> > > On Wed, May 25, 2016 at 12:31 PM, Chris Fala via vcf-midatlantic <
> > > vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> > >
> > > > Would this help?
> > > >
> > > > http://www.ebay.com/itm/152084733487
> > > >
> > >
> > >
> > > ​almost,
> > > that one has 6 outputs
> > > you need one with 10 outputs​
> > >
> >
> >
> > Thought the C64 user port only had an 8-bit port. Where are the other two
> > connected? The VIC has a few of the joystick port connected to the user
> > port, but not sure what other outputs you can get out of the C64.
> >
>
>
> The C64 cartridge board used a cmos 4028, 4bit BCD decoder​ [Binary Coded
> Decimal] which has 10 outputs.
> Even though the interface uses a 4bit binary number, the 4028 only converts
> the first 10 numbers, 0-9
> This in turn drives each motor arranged in a bridge circuit inside the arm.
> There are 5 motors in the arm  = base, shoulder, elbow, wrist, and gripper
> Each pair of outputs drive one motor
> The bridge circuit is wired for each motor with a split bipolar power
> supply using batteries, B+, Gnd, and B-
> Only one output on the 4028 is allowed to turn on
> As there is no protection against faulty data switching on both signals and
> causing a meltdown inside the arm
> Dan
>

OK. So only one output can be on at any one time with this setup? Kind of a
74141 without the high voltage?

Funny thing, I Googled 4028 without any other text and the datasheet was
the first search result.



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