Gumboot is a Microprocessor based addition to a computer that enables the user to access data from the outside world through the serial port. Because it uses the serial port Gumboot can be used with the entire range of Macintosh computers, and can be adapted to many others.
Gumboot has been designed to fill the following roles.
An 8 bit A/D conversion and Software combination that can be used to monitor simple processes, lab experiments, movement and direction. With access to other portions of the Microprocessor that allow for Input counting and timing, digital input and output control.
A Microprocessor Teaching / Learning tool.
To achieve this, the design has left access to all of the Microprocessor’s ports and functions while still providing enough basic circuitry for simple interfacing.
An option to have Isolation of the serial port, and the connected computer, is available and can be retrofitted if required. This means that, steps are taken to protect the host computer at the expense of Gumboot.
This option is also provided, and required, where Gumboot is used to monitor circuitry that has a unusual Earth connection or where a Potential Difference may exist between the Earth connection to equipment under test and the Mains Earth which is connected to the computer. An example is in Telephone Exchanges where the Positive side of the Battery supply is connected to Earth.
The Microprocessor that is used in Gumboot is a Motorola device called MC68HC11A8, which is an 8 bit microprocessor from the 6800 family. This chip was chosen because of the range of features that are offered and it’s simple interfacing needs. It’s features are documented in the Motorola Documentation supplied, but in summary the chip, and Gumboot provides,
Gumboot is supplied, fully tested, cased, and with software to allow it to perform many simple and useful tasks. A DC power supply is included along with a Macintosh miniDIN 8 serial cable and documentation for the software and hardware. In future I hope to provide a much cheaper version with just a tested PCB, software and documentation, and allow the user to find their own power supply, case and cable. ( G u m b o o t • L i t e. )
Fig. 1 a summary of Gumboot hardware.
The supplied Documentation covers Basic Hardware and the Software found in the ROM in the Microprocessor, in Gumboot. This is followed by the Documentation for the sample Applications that are supplied with Gumboot, DataLogger, VoltMeter, QuickDisplay and Jive. You may also use any Terminal Emulation programme, Z-term, FreeTerm Etc. with Gumboot. Some exercises are provided at the end to help become familiar Gumboot.
Gumboot, and accompanying software are being updated constantly, so as soon as it is worthwhile you will receive updates, or if you have a bug or suggestion please contact me.
Paul B Jones
P.O. box 208
Moora 6510
Western Australia.
The software include here have a Demo mode that allows you to see the style of display and functions that each application has and what sort of files it would generate.