The NANOKIT (Or NANO-KIT) is a National SC/MP II based single board computer with 256 bytes of RAM. You have eight switches to select the memory address and eight switches for the data which you then deposit (DMA!) using a momentary switch. Then you give the processor control and off it goes.
Unsurprisingly, the NANOKIT came as a kit, produced by a company (or maybe just some guys in a garage) calling themselves "Microsystems". Since the manual was printed in Cape Town, that's probably where they were based. And that explains why you've never heard of it. :-)
I bought the NANOKIT secondhand and prebuilt. Well, my parents bought it for me. It came with a set of ROMs piggybacked onto (well, under) the RAM chips, that contained a program to play "Die Stem" (The old South African Anthem) through one of the output pins.
The manual contains quite a few errors, and looking back I can see why I had such a hard time wrapping my brain around this stuff. OK, the fact that I was twelve at the time might have had something to do with it.
If you have more info, please contact me. If you're the author of the manual, I promise not to hit you any harder than necessary :-)
2002-09-23: Received email from Stephen Davies, who says that he also has one, which he got in 1977 or so. Stephen says he knew Andre Wagner who knew the designer.
|I took my NANOKIT apart, I needed the switches for another project (yea, I was young). I'm planning to put it back together, RSN.|
The SC/MP came in two flavours, namely P-MOS (INS 8050 ISP-8A/500 SC/MP-1, 1976) and N-MOS (INS 8060 ISP-8A/600 SC/MP-2, 1977).
The P-MOS SC/MP-1 is kind of strange in that it needs the standard +5V but also -7V. Well, it's actually not that strange -- if you call the +5V rail zero, then the voltages are -5V and -12V, the opposite of the +5V and +12V the Intel 8080 needs to run (OK, the 8080 also needs -5V, and to this day your PC power supply probably has a -5V rail even though there's nothing using it).
National Semiconductors offered a "SC/MP Demonstration Kit" (PCB 5514879/B, ISP-8K/200) (Manual dated March 1976) which consisted of a SC/MP processor, 256 bytes of RAM and a 512 byte Mask ROM. The ROM contained KITBUG which allowed the user to interact with the Demonstration Kit using a Teletype.
In October 1976 they added a keyboard and display, consisting of basically a calculator on a ribbon cable. A replacement ROM with "SCMPKP" firmware and a whole bunch of TTL was required.
The National Semiconductors Introkit (PCB 551305229) is slightly bigger than the Demonstration Kit it closely followed (in time and in design -- actually I suspect the schematics are identical). The instructions for the SC/MP Keyboard Kit cover both PCBs.
The Sinclair MK14 is very similar to these kits, which is pretty much the point of Demonstration Kits.
National SC/MP Keyboard Kit Schematic
Sinclair MK14 Schematic. Compare the right hand half of the schematic with the Keyboard Kit Schematic.
81ls97 3 ls95 2 3 x 81LS97 8-bit bus driver 4 x 74193 Synchronous 4-bit binary counter 1 x 2111 256 x 4 RAM 1 x 7402 quad NOR gate 1 x 7410 triple 3-input AND gate 2 x 74LS08 quad AND gate 2 x 7495 4-bit shift register
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