Maxwells’ Silver Doofer: Dead in the Water

Count this as the biggest of big fails for Retrochallenge 01/2016... Maxwells' Silver Doofer just never really got going. January was way too busy with massive amounts of commercial overtime, attempting to swim a distance equivalent to a lap of the TT course (for charitable porpoises), sorting out personal tax affairs (jeez, the govt make the … Continue reading Maxwells’ Silver Doofer: Dead in the Water

Maxwells’ Silver Doofer: Episode 2: Reasonable Gratuitous Incompatibility

The Idris Users Manual is a tutorial-plus-reference-manual for "plain-old" users of an Idris system: Excellent tutorials on logging-in, how to enter commands, use of files and directories, text-editing, using the command-shell, and so on; plus reference manpages for the commmand-line programs, specific file-formats (password file, /dev/null, timezone, login-history file, mounted-filesystems list-file, etc); plus a system-administration … Continue reading Maxwells’ Silver Doofer: Episode 2: Reasonable Gratuitous Incompatibility

Maxwells’ Silver Doofer: Episode 1: How Not to Start a Project

Sheesh! January so far has been insanely busy with overtime at work, and if you add in the start of the Mens' hockey season and the first Firemans' Run of 2016, I am turning up a little late to this months' Retrochallenge event. My original intent was to get started 10 minutes after the start … Continue reading Maxwells’ Silver Doofer: Episode 1: How Not to Start a Project

Small Things Come In Big Packages

During December 2015, Digi-Key Electronics have been running a Christmas Draw; by posting to Twitter or Facebook with an appropriate keyword ("#DigiWish"), you can wish for parts from their catalog, and if you are drawn out of the hat, Digi-Key would gift them to you for no charge and with free delivery. Of course, to … Continue reading Small Things Come In Big Packages

Maxwells’ Silver Doofer: Crass-Compiling

Once more unto the breach: Retrochallenge 2016/01 draws near and it is time to decide what my entry project should be. Icebergs: This time it is really hard to decide what on Earth to do - as outlined previously, the "Galaxy Pressed" project is just too expensive (although there has been a recent post on … Continue reading Maxwells’ Silver Doofer: Crass-Compiling

Evie Beer: Episode 9 – Doh! and Happy Ending

As we saw last time, I had been having trouble getting meaningful measurements of joystick position using the ADC. It only goes to show few many readers this blog has, because the circuit diagram showed exactly what the problem was, quite clearly, yet no-one commented! And of course all that impedance-limit waffle I spouted last … Continue reading Evie Beer: Episode 9 – Doh! and Happy Ending

Evie Beer: Episode 8 – RTFM!

This time, we're looking at the built-in analogue-to-digital convertor on the 68hc11. In principle, this should be quite easy, but in practice there turned out to be some caveats. First problem was that I had assumed that the breakout connector on the evaluation board SBC had port E wired in the same sequence as ports … Continue reading Evie Beer: Episode 8 – RTFM!

Evie Beer: Episode 7 – It’s A Stick-Up

The Other End Now that RetroChallenge is in the closing week, it is time to take a look at the *other* end of my breakout-board: That thar be a retro "Gameport" socket. I guess that gives a good indication of the next piece of hardware that I am attempting to interface to the 68hc11 SBC... … Continue reading Evie Beer: Episode 7 – It’s A Stick-Up

Evie Beer: Episode 6 – An Illuminating Debugging Method

Now that loading into on-chip EEPROM is working, I have written a few standalone utility routines so that the final program will not need to rely on the BUFFALO monitor (which isn't available in some operating modes). Simple things, such as output via the serial-port, analogue-to-digital sampling, digital input port reading and so on. This … Continue reading Evie Beer: Episode 6 – An Illuminating Debugging Method

Evie Beer: Episode 5 – EEPROM Tribulations

The last week of fiddling with the 68hc11 EVBU SBC has been a bit of a slog, with not much productive output... Bicycle Count The first task was to write a reliable parameterised "delay" routine, so I could ditch the awful mechanical workaround (wedge a keyboard key down!) I had previously used for the LED-flasher … Continue reading Evie Beer: Episode 5 – EEPROM Tribulations