The SX-64 to DX-64 Conversion Project
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The SX-64 to DX-64 Conversion Projects

Introduction

Welcome! This project is an attempt to create a "Commodore DX-64" computer by adding a second drive to a standard SX-64 computer. There were only a few real DX-64 machines ever made as prototypes, and there is some debate about how the dual drives functioned. On the SX-64 the drive is labelled "Drive 0" and the empty slot is labelled "storage". One might assume on a DX-64 that the second drive would be labelled "Drive 1". This would lead us to believe that the internal drives behaved like the old Commodore 4040-type dual drives, where there is ONE device number (ie: device 8) for both drives, and each is accessed using D0 and D1. That would suggest commodore had a dual-drive FDD controller board. However, no evidence I am aware of supports this, so in all likelyhood the drives were setup to be accessed as TWO device numbers, example DRIVE 8 and DRIVE 9.

This project assumes separate drive numbers. This is means we can build a "DX-64" by "simply" adding a second FDD controller board and drive mechanism.

If you are the lucky owner of a REAL DX-64 please contact me!

Parts Needed

SX Conversion #1 - Oct 16th, 2008

The construction pictures can be seen on Flickr. Please check here

Things to watch out for:

COMPLETED! Started Oct 16th, 2008 at 1pm and was completed at 6pm the same day.

SX Conversion #2 - Sept 21, 2010

A fellow collector asked me to convert his SX-64 for him. He sent me the SX-64, extra drive, controller, and some cables. For his machine I tried a few things new. Firsly, I noticed that the drive brackets could be reversed, eliminating the need for spacers to hold the second drive in. I also constructed a Y-cable for the internal IEC connection. In an attempt to make more space for the FDD boards I de-soldered the power connectors from the board attached them with wires soldered directly on the board. Unfortunately the drives didn't work, so I ended up borrowing the drives from my own DX-64 conversion. When I get some time I will have to investigate the reason.

The construction pictures can be seen on Flickr. Please check here

Contact

Last updated: Apr 4/2014, 11:00am EST

Send comments or feedback to Steve Gray(sjgray@rogers.com)