RNB Enterprises sold a range of AIM 65/SYM-1/KIM-1 extension cards, ranging from a VAK-1 Motherboard, RAM and EPROM cards anda prototyping card.

Photo by Eric Dennison
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VAK-1/2/4 manuals RNB Enterprises User Manual VAK-1 Motherboard Schematics of VAK-1 Motherboard User Manual VAK-2, -3, -4 (2x 8KB SRAM boards) |

Photo by Eric Dennison
Byte Magazine 1979 01 RNB Enterprises SYM-1 KIM-1 VAK-X boards advertisement
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Byte Magazine 1979 01 RNB Enterprises SYM-1 KIM-1 VAK-1to VAK-8 boards advertisement |
See also:
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MTU and Eduardo Casino
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MTU K-1000 power unit
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K-1013 floppy controller
Used in the early KIM-1 MTU bus system and in the MTU-130/140 systems.
16K RAM
Bootstrap ROM 256 bytes
Double ...