DT001

Jumpers Explanation and Summary:

• J1, J2, and J3 are used for Input and Output connections to other boards or devices.
• J4 is used for In-Circuit programming to a suitable target board.
• J5, J6, J7, and J11 re-configure the RS-232 circuitry for Basic Stamp II operation.
• J8 shorts out the Reset Resistor to zero ohms.
• J9 and J10 offer an alternative connection to the SimmStick bus for the main RS-232 signals. This may suit Basic Stamp I users that require RS-232 on pins 1 to 8. (Port B).
• J12, J13, and J14 allow BS I users to program their Stamp via the DT001 board and the standard DB25 printer port cable.

All Jumper positions are default set to the most common configurations. If there is a requirement to alter these settings, you may need to cut a track on the solder side ot the board, and install a strip of 2 or 3 pin male header pins, and test (or jumper) links.

There is one jumper on the component side of the board at J12. Don't ever cut this. I would have liked to put all possible track cuts on the component side of the board but decided it was safer on the solder side. This way, no one would solder in headers and then be unable to cut the tracks.

J1 to J3 are I/O (input/output) connection points for expansion of signals from the DT.001 PCB to other boards and devices.

J1      10 pin programming Header for connection to suitably designed
        target board such as the DonTronics PIGMY board.

J2      34 pin Port B and C header. Matches the DonTronics Relay board
        bus.

J3      30 pin Simm Bus expansion. Standard procedure is to solder a
        30 pin right angle female header socket to this.

J4      Alternative connection points for normally un-used RS-232
        input and output. The 'IN' portion signal (not the header pin)
        is used for BS-2 comms.

J5      Normal: Leave pins 1 and 2 connected together.
        BS-2:   Cut the track between pin 1 and 2 on the solder side
                of the board. Install a 3 pin male header. Put a test
                link between pins 2 and 3.

J6      Normal: Leave pins 1 and 2 isolated.
        BS-2:   Install a 2 pin header and jumper link. This signal
                can be used to remotely reset the CPU device via an
                RS-232 input line. Used in conjunction with J11.

J7      Connects the D-9 pins 6 and 7 together for BS-2 operation.
        Can be a set of 2 header pins and a link as before, as it may
        need to be removed.

J8      Shorts out R15 (330) as some brown out circuits may need a more
        direct pulldown to ground.

J9      Carries RX or Serial In to SI on SimmStick Bus via pins 2 and 3.
        An alternative path can be provided via pin 1 to D0 of the Simm Bus.
        Again, isolation by track cutting and header pins needs to be done.

J10     Same as for J9 but carries TX and alternative path is to D1.

J11     Connects pin 4 of the D-9 connector to reset in for BS-2 operation.

J12     Used for BS-1 operation. The track this time is on the component
        side of the board, and no track cut is required.

        Normal operation: Link on pins 2 and 3.
        BS-1:             Link 1 and 2 together.

J13     Used for BS-1 operation. The track cut is on the solder
        side of the board.

        Normal operation: Link on pins 2 and 3.
        BS-1:             Link 1 and 2 together.

J14     For BS-1 operation. Cut the tack on the solder side of the board.
        Install a 2 pin male header and a link to restore to normal
        operation. This isolates the pullup resistor and the 7407 input
        gate.

J15     A 26 pin male header position has been added. This is pin
        compatible with the DonTronics PIGMY board MAD Bus header.
        Gives the ability to extend the full Micro signals on a 26 wire
        flat ribbon cable and crimp connectors. The PWR, +5V, and GND
        dual posts near J3 were removed (Rev B) to make room for J15.    

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