Micro Technology Unlimited produced a lot of hardware for the KIM-1, SYM-1, AIM 65 and more. The company still exists, now sells music software.
Started by Hal Chamberlin (of fame woith his articles in Byte about musci generation with computers), it sold a lot of music related KIM-1/SYM-1/AIM 65 hardware and software and later standalone MTU130 6502 based computer. The company is still in business.

	MTU Fall 1980 6502 Peripherals and Software catalog
	MACASM User Manual (MTU130)
	K-1008 by MTU, video display 320×200, 8K memory manual
	Use of the K-1008 for grey scale display, app note #2
	K-1020 Prototyping board by MTU
	K-1012 PROM/IO board by MTU, 2 PIA, EPROM, 1 ACIA 2708/2716 programmer manual
	K-1009-IC AIM 65 Printer Enhancement Package

K-1008 Visible Memory

K-1008 Visible Memory

K-1012 PROM Expansion Board

K-1012 PROM Expansion Board

K-1016 Memory Expansion Board

K-1016 Memory Expansion Board

K-1020 Prototype board

K-1032 Expansion Board

K-1032 Expansion Board