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The Mostek 3870 and Fairchild F8
The National Semiconductor SCMP
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Accumulator Address Bus address lines Bidirectional buffer Channel chip clock periods clock signal Control code Control register bit control signals Counter register counter/timer Current Data Bus Data Counter data memory decrement Delay Direct Memory Access disabled Edge Enable external interrupt external logic flag Halt handshaking high-order byte high-to-low transition I/O Port illustrated as follows Index register instruction execution instruction fetch instruction set Interface Logic internal interrupt acknowledge interrupt logic interrupt request interrupt service routine Interval Timer Latch Load low-order byte low-to-high machine cycle memory address memory location microcomputer microcomputer system microprocessor object code operation options PICU pins and signals ppqq Program Counter program memory Pulse Width read-only memory read/write register contents SC/MP scratchpad serial data serial I/O specified Stack Pointer Status register Status register bit Strobe support devices SYNC System Bus Table vector write