Vintage Board of Education


Picked up a Stamp Discovery kit that somebody was practically giving away.

This BOE is MADE!

Looks like the old IBM 8086 motherboards and expansion cards.

Ruggedized to survive a nuclear blast!

Even has silk screening on back.

'Try our Stamps in Class tutorials' Then list about 10 of them.

Has other useful info on it too.

That was money well spent!

Comments

  • Picked up a Stamp Discovery kit that somebody was practically giving away.

    This BOE is MADE!

    Looks like the old IBM 8086 motherboards and expansion cards.

    Ruggedized to survive a nuclear blast!

    Even has silk screening on back.

    'Try our Stamps in Class tutorials' Then list about 10 of them.

    Has other useful info on it too.

    That was money well spent!

    Okay now please display photographs.

  • Mr Rogers

    Okay. Well I will fish it out and post the Rev #.

    Little hard to take pictures right now.

    If you have a pressing need I could attempt it.

    Let me know.
  • microcontrollerusermicrocontrolleruser Posts: 1,194
    edited 2017-08-02 - 06:10:13
    Buck Rogers

    Rev D

    Has a 28850 on the back.

    It could be the greenest PCB I've ever seen.

    Plus the whitest and clearest silksreening. Easy on the eyes.

    Pretty nice soldering on it too

    Does NOT say Board of Education on it anywhere. Front or back.

    Oops! Yes it does. It's just small and in Chrome lettering! Like leaf on 'Stamps in Class' apple.

    Hope that helps!
  • GenetixGenetix Posts: 1,457
    edited 2017-08-03 - 14:40:43
    microcontrolleruser,

    The part number 28850 is for the USB version of the Board of Education and Revision D appears to be the most current.
    https://www.parallax.com/product/28850

    Green has been a standard "solder mask" color on Printed Circuit Boards, or PCBs, for decades.
  • microcontrollerusermicrocontrolleruser Posts: 1,194
    edited 2017-08-05 - 05:31:47
    Genetix Thx!

    We're saving it as a collectible.

    Don't want to fry it by mistake!

    Will just breadboard a Stamp 1 and 2 DIP.

    Also we don't use the Stamp 1 kit board we have with the SIPP module.

  • ercoerco Posts: 19,601
    We're saving it as a collectible. Don't want to fry it by mistake!

    What Gus is saying... is that your "collectible" board is brand new and still in production.

    Fry away, Dixieland.

  • Thanks Erco

    'Sorry Dave. I can't do that'-2001 A Space Odyssey

    Nope. It goes in the collectible box.

    Will just use Homework board.

    No off switch but 'Oh well!'.

  • microcontrolleruser,

    The Homework board has built-in 220-ohm protection resistors on each of the I/O pins so stick a 220-ohm resistor between the I/O pin and circuit of anything that you hook up to your Board of Education.

    Also, the BASIC Stamp is rugged so unless you are using a high voltage it's unlikely that "The Magic Smoke" will escape.

    Oh, and the BASIC Stamp can easily be replaced on the Board of Education but it's soldered onto the Homework board.

  • Thanks Genetix

    ' Homework board has built-in 220-ohm protection resistors on each of the I/O pins'

    Never noticed that or may have forgotten.

    Okay. On to the next project.

  • microcontrolleruser,

    On the Homework board those protection resistors are in what's called a Resistor Network which looks like IC similar to a PIC instead of the individual resistors you are probably more familiar with.

  • Thanks Genetix

    Okay. An IC in place of so many separate resistors.

    So it shows up better on the schematic than looking at board.

    Got it.
  • ercoerco Posts: 19,601
    The HWBs I have used all have SMT resistors, which, with careful soldering, can be bypassed for certain applications where the resistor causes problems.

    HWB.png
    600 x 440 - 525K

  • Thanks Erco

    Okay. So a Stamp on a breadboard has 'clean' pins.

    I will look for those 'hidden' resistors on Stamp1 Project board Propellor Pro board and

    a couple others we have accumulated.

    In the Parallax manuals I think they use the phrase 'protected' by the resistors.

    Never noticed the circuit per se.
  • My LEDs I took out of a toy Lightsaber handle around 7.5v, so I only need 220s when using Parallax LEDs for IR etc.

  • 'My LEDs I took out'

    One of my tech buddies does that.

    I just buy 'em.

    Not quite into taking apart old electronics to see how they work.

    Cars yes.Electronics no.
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