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The Mostek 3870 and Fairchild F8
The National Semiconductor SCMP
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8048 series microcomputers Accumulator Address Bus Bidirectional buffer byte Channel chip clock periods clock signal Control code Control register Control register bit control signals Counter register Data Bus Data Counter data input decremented Delay Direct Memory Access disabled enabled external data memory external interrupt external logic external memory Falling Edge Halt handshaking high-order I/O Port illustrated as follows Index register Input/Output instruction execution instruction fetch instruction set Interface Logic interrupt acknowledge interrupt logic Interrupt Priority interrupt request interrupt service routine IORQ latched Load low-order machine cycle memory address memory location microcomputer system microprocessor object code on-chip operation options pins and signals ppqq PROG Program Counter program memory Pulse Width read-only memory register contents reset Rising Edge SC/MP scratchpad serial I/O Stack Pointer Status register Strobe support devices Symbol Parameter System Bus write Z80 PIO