Downloader

The downloader for the assembler is a simple program. To execute it, type "dlm .s19. For a program to successfully download, the serial cable must be connected to the Miniboard, the Miniboard must have power, and the Miniboard must be in download mode. If a Miniboard is connected the PC via the serial cable, the green "receive" LED should be on regardless of weather or not the Miniboard has power connected to it. To put the Miniboard in download mode, push the slide switch to the download position (the stub of the switch is nearest to the 6811 chip) and press the reset button. After pressing the reset button, the red "power" led indicator should become very dim and the green "receive" LED should go off. When you type in the "dlm .s19" command on your PC, you should observe flickering of the "receive" and "power" LED's during the data transfer. The DLM program will first attempt to verify connection with the Miniboard at 1200 baud. If Miniboard synchronization succeeds, then the DLM program will continue on to download the s19 file at 9600 baud. DLM produces a messages at two different points. The first will be a message about the success/failure of synchronizing with the Miniboard. If a failure occurs here, check that the serial cable is plugged in, that the Miniboard is in download mode (the green LED is off), that power is supplied to the Miniboard, and that the pin outs on the serial cable you built are correct (try swapping the TX and RX pins if every thing else seems right, it is very easy to confuse them). If synchronizing with the Miniboard succeeds, the next and last message from the DLM program will be a success/failure about downloading the program. If Synchronization succeeds and downloading fails, check that you have a good power supply (not a weak battery), or try replacing the 6811 chip (or try downloading to a friends Miniboard).

Back to Table of Contents