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.

The SS50-6800, SS50-6809 and SS50-6502 processor boards are not being reproduced in their current form and may be released at a later date with improvements.  For now you can use the SWTPC reproduction MP-A2 for a 6800 processor board and the SWTPC reproduction MP-09B for a 6809 processor board.  These boards do not include any onboard RAM like the Corsham processor boards, so you will need to purchase a PT-SS50-64K memory board. 

News: 4/17/24 - The Corsham 6800 replacement is now available.

News 5/29/24 - The Corsham 6809 replacement board is available

The SS50-6502 is likely to run faster than the current board.  At least 10MHZ and have on board RAM and EEROM to support this speed. The SS30 access speed will be reduced to 2MHZ to allow commonly available IO boards to be used.

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.

NitrOS9  needs further work before it can be released.  For those who want to try it now, you can download the source from sourceforge.net and build your own copy.  On our system, NitrOS9 suffered with several problems.  The most serious was that it locked up from time to time.  Booting was also hit or miss.  Sometimes it would boot fine; other times it took several attempts to get it to boot. Sometimes it would run for hours without problems; other times it would only run a few minutes.  The board set used for the NitrOS9 test had OS9 ROMS installed and then ran OS9 with no problems.  This rules out problems with the hardware.  Unless you want to do serious system debugging, or want a really good challenge, I wouldn't try building your own copy of NitrOS9 from sourceforge.  Our plans are to port NitrOS9 to the SWTPC hardware and test it before working on the SD Shield driver.  By doing this we eliminate everything but the SD Shield driver.  This needs to be done since I have no experience with NitrOS9. The estimated time frame on this is several months.

OS9 is supported on the V5 Corsham 6809 reproduction if you want to use an SS30-Extender.  Details here - Corsham SS50 6800 Processor

	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 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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