Re: [CAD_CAM_EDM_DRO] Board ????????????

On Fri, 07 May 2004 21:17:13 -0700, you wrote:

>Gentlemen
>
>I came across some boards that might be of use to someone, even
>me if I knew what they were. One has a hand written date
>on one of the chips indicating 1995. The board say microcontroller 1.
>They are 5 x 7 inches. The connector across the end has 40 fingers.
>10 are hooked up to the circuit on the board.With the fingers at the top,
>in the upper left (component side) is a 5 volt regulator device with
>double heat sinks. on the right side are two connectors.

that's an old style board.

>One is a
>14 pin (2 rows of 7) and the other 20 pin (2 rows of 10)
>Next comes a Zilog Z8 Z0867108PEC CPU (?)

Yep, microprocessor.

>Next major component is a 28 DIP socket with a 24 Dip device

Probably ram or rom, as a guess.

>Below this is a SN74150N 24 DIP device feeding 8 8 DIP devices

8 dip devices, possibly something like 75451 or 75452, they're dual
drivers, although 8 is probably not needed, not sure why 8, since 4
would work unless they paralleled both drivers in the chip (8
drivers). could also be optoisolators

>each of which goes to two resistors and thence to a 40 pin (2 rows
>of 20 like above). These look like maybe they would go to the coils
>of stepping motors ? ? ?

74150 is a 16 input to 1 multiplexor, so it sounds more like it's
looking at 16 inputs, would be good for sensing home/limit switches.

>On the left side at the bottom are 14, 16, 18 DIP devices that go
>to another 40 pin connector.

can't help here, although those might be some sort of driver.

>
>I got these wih some Pacific Specialties (Now Danaher) drivers,
>stepping motors. I really just thought I wanted the stepping motors
>as they are like the ones on a MAX NC Table Top mill and hoped
>someone would want some to.

Harvey

>
>bob mcknight phoenix arizona
>bobmcknight@...
>
>
>
>
>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
>Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
>List Mom
>List Owner
>
>
>Yahoo! Groups Links
>
>
>
>
>