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The Memotech MTX Series |
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Memotech Photos - SDX
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Original Memotech "flyer" for
the SDX |
My SDX Controller from ebay.de |
Here you will find a selection of detailed pictures of various
SDX systems. The number of photos is probably a bit of overkill,
but I find it interesting to see how much variation there was in
the way that Memotech assembled many of their products.
If you click on the images
below, the full size picture will open, be aware, many of these
are quite large and may be unsuitable for display on mobile
devices or with a slow internet connection, but I wanted to
include as much detail as possible in the larger photos.
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SDX Controller -
Original Version |
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A selection of
pictures from
SDX/19985
One of the first SDX controller
models, this one has the CP/M ROM fitted
Photos courtesy of Jan Seyfarth |
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Over head view, you can see the edge connector which is
used to connect to the MTX cartridge port on the left
hand side of the machine. |
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Rear view of the controller module, showing the floppy
interface connector and a 3.5mm jack for external 5VDC
input. The Memotech floppy drives had an internal
240VAC power supply and provided a 5VDC output to power
the controller module - there is not enough power
available from the expansion bus connection. |
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View of the FDC05 disk controller board. This board
was designed by Tony Brewer, and with his help, I have
drawn a schematic of the board - you can find it
on this page. |
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The SDX was available in two version, one which provided
disk functionality for MTX BASIC and one capable of
running CP/M. This controller has the CP/M ROM fitted,
in order to work, the MTX needs to have 64K of RAM and
an 80 Column video board fitted internally. |
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Solder side of the controller board |
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Solder side of the controller board |
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SDX Controller -
Original Version |
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A selection of
pictures from
SDX/24985
Same model as the one above -
also capable of
running CP/M
This is my own SDX controller |
| Slightly different aspect view of the
controller |
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| A boringly similar photo of the rear of my
controller |
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| Internal view of my controller board |
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| Solder side of the SDX FDC-05 Disk
Controller |
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| Underside & rear view of my controller |
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The original version of the
controller PCB : FDC-03 |
| As described in the original Memotech
product "flyer", the earliest
SDXs were shipped with version 03 of the
controller board - FDC-03 It appears that the
ROM is a Type-2, non-CP/M, version for Australia
Photo courtesy of
Chris Marsden |
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| Solder side of the SDX FDC-03 Disk
Controller Photo courtesy of
Chris Marsden |
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SDX Controller -
Series 2 Version |
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A selection of
pictures from
SDX/32074
The SDX Controller released for the
MTX512S2
This is my own SDX Series 2
controller. |
| The "new" style SDX controller with integral
3.5" drive. To incorporate the drive, the profile of
this SDX is much "squarer" than the
original SDX controller and the MTX itself. |
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| The controller fitted to an MTX512S2 -
showing the contrasting profiles of the MTX and
the "new" SDX controller. |
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| The base of the Series 2 SDX controller,
there are two tapped holes adjacent to the edge
connector for a metal plate used to attach the
controller to the base of the MTX, intended to provide a
more secure connection. |
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| Rear view of the controller, showing the
internal floppy drive cable, linking the SDX
controller board to the 3.5" floppy disk drive
above it. The PSU input is at the right hand
side - the Series 2 controller uses the same
model of PSU as the MTX itself. |
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| Top cover removed, showing the disk
drive and interface cable to the disk controller board.
The drive fitted to this SDX is a NEC FD 1036A |
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| Internal view of the SDX with the floppy
drive removed, exposing the disk controller board.
This SDX has the optional CP/M ROM as well as the
optional 512k of memory installed on the disk
controller. The memory on the disc controller was
available for use as a RAM disk |
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