SWTPC Reproduction Boards

These boards came to be reproduced due to an accident I had when testing an FD2 controller. I had an FD2 plugged into an SS-30 extender board. While adjusting the data separator, I dropped the screwdriver I was using. It bounced around and ultimately fell across a 120V connection and pins on the mother board. Traces were vaporized, chips exploded, and almost all of the chips on the various SS-50 and SS-30 boards were destroyed. My system was not in great shape even before the accident. I had to rock the CPU board most of the time before I could get the system to start. It became apparent I needed new or at least used boards in much better condition than what I had. There were no SWTPC boards for sale on EBAY at the time, and the only source of boards I could find were not exactly a close match of SWTPC products. I finally acquired a used SS-50 MB, and after much effort I got my CPU board running although many traces had been vaporized. I ended up first making a reproduction of the MP-B3 mother board which was intended for 6809 boards and SWTPC's later style cabinets. However my cabinet was a 6800/6809 hybrid cabinet that was shipped between the 6800 cabinets with the screen top and the later 6809 style cabinets. My case had an MB-B2 mother board modified by SWTPC to use a MP-09 CPU board. My second mother board was a new design mother board with MP-B or MP-B2 mounting holes but contained circuitry close to what was used on the MP-B3 mother board. I made changes so that with moving a few shunts the board could be used for either a 6800 or 6809 CPU board. From this point I have replicated more of SWTPC's boards or in some cases designed completely new boards.

The purpose of these reproduction boards is to closely match SWTPC's design and appearance, not to make massive improvements in the original design. The changes to these boards are minor and mostly consist of these boards being solder-masked on both sides and silk-screened on the top. In a few cases extra pads were included to accommodate the closer lead spacing on today's parts. The goal was to be able to plug one of these reproduction boards in place of an original SWTPC board and not notice any difference in how it operates.

With these boards it is possible to replace damaged and poor working boards in a SWTPC system that have become rather difficult to find in good condition today. It would be possible to build a complete SWTPC style system if you desire.

These are the boards that are available now. There are others in the works.

SS50 and SS30 Boards Reproduction SWTPC and PT designed boards

	6800 MP-A2	SS50 Reproduction SWTPC MP-A2 6800 CPU Board for SWTPC SS50 6800 Computer Available in 1 MHZ and 2 MHZ boards
	6809 MP-09B	SS50 Reproduction SWTPC MP-09B 6809 CPU Board For SWTPC SS50 6809 Computer Available in 1 MHZ and 2 MHZ boards
	PT-B2 Product Page	Replacement Mother Board for SWTPC MP-B2 Has same mounting holes as SWTPC MP-B and MP-B2 Fits original SWTPC 6800 Cabinet Has onboard Baud Rate generator Can be used with 6800 or 6809 CPU 6809 can use S0-S3 for A16-A19 to support 1MB memory on SS50 BUS Configures with shunts to quickly change from 4 addresses to 16 address per IO slot 8 SS30 and 7 SS-50 slots
	MP-B3R	Reproduction of MP-B3 Mother Board Has same mounting holes as MP-B3 Fits SWTPC 6809 Cabinet with removable IO card covers on back. Has Baud Rate Generator on Mother Board Feed SS30 baud rates from Mother board or CPU board. Allows S0-S3 to be used for A16-A19 to support 1MB memory on SS50 BUS 8 SS-30 slots and 8 SS-50 slots $145 - Assembled - ready to install - with power wiring
	MP-MB Motherboard	Reproduction of MP-MB Motherboard Used in SWTPC S/09 Computer System This Motherboard requires MP-ID board. The MP-MB and MP-ID were used mostly in UNI-FLEX systems. SBUG and FLEX were also available. $70 - Bare Board, $150 Assembled
	MP-ID	Reproduction MP-ID Interface Driver Board Used only with MP-MB Motherboard. Baud rate generator for SS30 slots Parallel Printer Interface 6840 Timer
	S50-PT-64K Product Page	64K Memory Board for 6800 or 6809 Systems Cannot be used in systems that support more than 64K Memory Memory can be disabled in 4K blocks at 8000, 9000, A000, B000, C000 and D000
	PT-SS50-1MB Product Page	1MB Memory board for 6809 systems with extended addressing Memory from 80000 to FFFFF can be disabled in 64K blocks Board provides 896K of memory for SWTPC S09 system. The maximum supported. $39 Assembled $14 - Bare board + PAL
	S30-IDE Product Page	SS30 IDE Controller board SD Adapter plugs directly into SS30-IDE card and clears top of SWTPC cabinet Modified S-Bug boots FLEX9 on 6809 systems Modified SWTBUG boots FLEX2 on 6800 systems
	FD-1 Product Page	FD-1 SS30 Bus Floppy Controller Board for SWTPC SS50 6800 Computer 4 Addresses per IO slot
	DC-2 Product Page	Reproduction SWTPC DC-2 Floppy Disk Controller This board uses a WD1771 This board is for single sided, single density drives
	DC-3 Floppy controller	Reproduction of SWTPC DC-3 Floppy controller Uses WD1771 floppy controller chip This board supports double sided single density drives
	FD-2 Product Page	FD-2 S30 Bus Floppy Disk Controller Supports double sided/double density drives For SWTPC SS50 6800 6809 Computer For an update version of this board use the FD-2A
	FD-2A Product Page	Updated version of FD-2 Same specs as FD-2; updated for easier to obtain IC's Configurable for 4 or 16 addresses per IO slot FLEX 2 Drivers are available to support double sided/double density drives FLEX 9 - Boots SWTPC FLEX with no driver changes
	SS50-EXT	SS50 Extender Board For SS50 based computer systems Price $26
	SS30-EXT	SS30 Extender Board For SS50 based computer systems Board is a new layout with ground plane, solder mask and silkscreen Price $20
	MP-C	SWTPC Reproduction MP-C Serial board Used only with 6800 systems
	MP-L	SWTPC Reproduction MP-L Parallel Board Used in SWTPC 6800 systems. Bare Board $7 Assembled $39
	MP-LA	SWTPC Reproduction MP-LA Parallel Board Improved MP-L PIA Data lines are selectable as either outputs or inputs. Bare $7, ASM $49
	MP-L2	Reproduction MP-L2 Parallel Board This board used in SWTPC 6809 system with slots at rear of cabinet. Bare Board $10
	MP-P	SWTPC Reproduction MP-P Power Supply Board Used in SWTPC 6800 Computers and early 6809 systems that did not have removable rear covers Use to repair an old system or to create a new PS $3 - Bare Board
	MP-PS	SWTPC Reproduction MP-PS Power Supply Board Used in SWTPC 6809 Computers Use to repair an old system or to create a new PS $4 - Bare Board
	MP-S	SWTPC Reproduction MP-S board RS232 - Serial Board $7 - Bare Board
	MP-S2	SWTPC Reproduction MP-S2 Board RS232 - 2 Port Serial Board $7 - Bare Board
	MP-T	SWTPC Reproduction MP-T Timer Board $7 - Bare Board
	PT-S	Modern Replacement form MP-S RS232 Serial Board
	PT-SS30-TERM	VGA/PS2 keyboard at $E004, RS232 port at $E000 $7 - Bare Board - Requires a PCKit3 chip programmer. $39 - Assembled
	PT-146818	RTC for SWTPC 6800 and 6809 1MHZ or 2MHZ Operation Use with 6800 FLEX, 6809 FLEX or OS9