Enhance your Sphere system with an essential upgrade: as much RAM as you want with one low-power and reliable 64K static memory board. A base Sphere system can't even load a BASIC, but now you can. This full-size retro-vintage creation looks right at home cabled into your Sphere system, and includes a cassette tape containing a memory test program plus a detailed manual. Upgrade your Sphere just like it's 1976, and support the book project at the same time!
Enable or disable access to any 4K block of address space. Standard systems will accommodate 52K of additional memory -- equivalent to four (!) MEM/1 boards, and far more reliable. The board also adds termination for the noisy data bus.
Grippy new-old-stock 14-pin sockets will hold your ribbon cables securely. All components on the SPHERE MEM/6 MODULE are either actual NOS/vintage parts, or were available in the mid 1970s. (Except the static RAM chip, of course, but you have to look close to know.)
A Sphere-compatible program cassette including a memory test program to validate your new RAM-- or check your original DRAMs for issues. (Requires SIM/1 board and PDS-V3N or compatible ROMs)
Instruction and technical manual including setup information, Theory of Operation, and board schematic. Xeroxed and three-hole-punched. Just like the old days.
The SPHERE MEM/6 MODULE package including board, program cassette, and manual-- fully assembled and tested-- is available for $100, postpaid in the United States. This is a real product-- I will happily sell you one-- but it's also in some sense an art project. I don't know if there's anyone out there besides me who actually needs it! I went all the way on the 1970s PCB styling and packaging as a way of understanding how small technical products were assembled in that era. Also, it was super fun.
If you would like to purchase a SPHERE MEM/6 MODULE, email me at bzotto at gmail dot com with questions or for a PayPal invoice.
Please note that any bundles sold will be "handmade to order" and may use slightly different parts or colors to what you see here. But fully tested! :-)
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