The early digital control boards had 9 ICs and the late boards only had 5 and one of them was a PROM.

73, Joe KC9LAD

At 06:55 PM 3/22/2010, you wrote:
My TR7 manual shows U201 as a MC14028 IC, not a PROM and Digi-Key sells them for 52 cents, am I missing something here.

Mike  W6MXV

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