Note
QST, May 1976, p. 105.
QST, Feb 1977, p. 119.
MFJ’s CMOS Keyer used an 8043 chip. It had a built-in paddle and speaker. When used with an external squeeze key, it operated in the iambic mode. The speed range was 8–50 wpm and its keying transistor was rated to 300 VDC.