Posted on

New SD Shield!

We are now shipping revision 4 of the SD Shield!

CT_New_SD_Shield - 1

This has everything version 3 had, as well as a few new goodies:

  • The Micro SD card socket (J2, on the far left) has been moved over 1/4″ so it may stick out the front or rear panel in a chassis.
  • A four position Options DIP switch.  Current software doesn’t use them but will display the values on the console.  We wanted this for future options, or users may program their Arduino code to use the switches.
  • More lines between the Arduino and the 68B21 on the parallel board.  While these aren’t used now, they might be in the future.
  • A new interrupt line from the Arduino.
  • Software on the Arduino can detect whether it is running on the old or new shield.

To go with the new hardware, there is a new version of Arduino software:

  • The new software can run on old or new shields; it detects which it is on.  Ie, any version of Arduino code runs on either old or new shields.
  • Real Time interrupts are provided, in speeds of 10, 20, 30, 40, 50, 100, 250, 500, and 1000 milliseconds.  Any interval of 10 ms intervals can be programmed by the user.  This was added to allow timesharing type operating, such as for OS/9 or printer spooling.
  • Software reads the four Options switches, but currently does nothing with them.

Old boards can be updated to provide the real time clock interrupt source by soldering two wires onto an older version shield.

I’m in the process of putting the latest Arduino code and the Remote Disk Protocol Guide onto the website.

Oh, no price change for this version of the board.  It costs a bit more to manufacture because of the slightly larger surface area and the DIP switch, but not enough to justify a price change.


Posted on

New Revision of 6809 CPU Board

Over the last couple of months I wasn’t doing much work on new products but did try to update some existing ones.  As I’m building and using boards, I make notes of errors and things that could be improved, and as the inventory of boards starts dropping low, new spins of the boards are ordered.

First update: A new spin of the 6809 board.  No new features, just fixes.  The rev 1 boards had a number of cuts and jumpers to fix design flaws, so the new board has all those fixes.  One bug remains: one of the ICs is still mislabeled!  For anyone buying assembled boards, none of this is significant, but for those who are building from bare boards, the new revision is a bit easier.  The first board built worked perfectly the very first time.


Posted on

Happy 4th of July!

Happy 4th everyone!  Be careful with those fireworks!

Most of the towns around us had their firework displays over the past couple of nights so it’ll be quieter this evening out here in the suburbs.