Corsham Reproduction Boards

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These Corsham boards have been reproduced.  These boards allow the creation of a small and cheaper SS50 system.  If you want to build an SS50 system but find the cost of a used SWTPC board set or reproduction too expensive this is the least expensive way to build an SS50 system.

Please be aware that due to the lower number of slots this solution is not the best if you are looking to run more than 2 SS-30 IO boards.  You will need a serial board and the SD card system to have a usable system.  If you want more IO cards it would be better to buy an SWTPC motherboard.  While there is an expansion SS30 board to give  you the full 8 SS30 slots, it would be more expensive than just buying a larger SWTPC reproduction motherboard.  However if you start with the Corsham motherboard and decide you need more SS30 slots at a later date, the SS30 extender does make sense.

The Corsham 64K and 1MB memory boards are not being reproduced.  These boards have been shown to experience problems under some conditions.  Use the PT-SS50-64K and PT-SS50-1MB boards as replacements.

News 5/30/24 - A replacement board for the Corsham 6502 SS50 is under development. The prototype runs at 8MHZ with SS30 slots at 2MHZ.  There is sill a lot of work and probably at least 2 more prototype boards before the board is ready for sale.  For software FLEX 6502 is being developed and currently runs on a simulator.  FLEX 6502 has the look and feel of TSC FLEX.

News 8/30/24 NitrOS9  has been debugged and is stable on the test system.  The two major problems were the 6850 was initialized before the DAT  and a pull down resistor was needed.  On power up the SD shield takes longer to become ready than the 6809 processor.  The processor board would attempt to load NitrOS9 before the SD Card system was ready. This resulted in the system hanging and it was almost impossible to reset the SD card system and processor so it would boot.  Occasionally the system would boot, but most of the time it didn't until a pull-down resistor was added.

NitrOS9 details are on the Corsham SS50 6809 Processor  page.

	Corsham SS50 Motherboard	Corsham Reproduction Motherboard. 3 SS50 slots 2 SS30 slots Supports 6800 and 6809 processor boards
	Corsham SS30 Extender	Reproduction Corsham Extender Board Add 6 SS30 slots to your Corsham Motherboard Plugs into your Motherboard
	Corsham 6802 Processor	Improved Reproduction of Corsham 6800 processor 2MHZ 52K RAM, 8K EPROM
	Corsham 6809 Processor	Improved Reproduction of Corsham 6809 Processor Board 2MHZ 128K RAM Select from up to four Boot ROMs
	Corsham SD Card System	Corsham SD Mass Storage System Can be used with 6800 and 6809 systems
	Corsham SS30 RS232 Serial	Corsham Reproduction RS232 Serial board Can be used with 6800 and 6809 systems No plus and minus 12V supply needed
	Corsham SS30 USB Serial Board	Similar to Corsham USB Serial Can be used with 6800 and 6809 systems No plus and minus 12V supply needed
	Corsham SS30 Parallel	Corsham Reproduction Parallel Board Provides Direct connection to SD Card System Use with 6800 or 6809 systems
	SS30 Proto Board Small	SS30 Prototype Board
	SS30 Proto Board Large	SS30 Prototype Board - Large
	SS50 Proto Board	SS50 Prototype Board

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