National Semiconductor SC/MP
The SC / MP was supported by the National Semiconductor Corporation, Santa Clara, CA / USA ( www.national.com ) mid-1970s manufactured microprocessors as one of the first commercial 8 -bit architecture and marketed successfully. The processor name SC / MP (pronounced " Skemp " English nickname " Scamp " ) is an acronym and stands for " Simple Cost-effective Microprocessor ".
Single-board computer
One of the first DIY computer was from Elektor -Verlag in June 1977 (G 3078EX ) on the basis of the SC / MP (initially type I, but fast Type II) published. Another kit was brought by the electronics manufacturer, and study material provider Christiani publisher of Constance as SC / MP computer teaching in 1978 to the market. On the basis of the type III a further teaching computer kit from Philips was still 1983, and later brought Schuco on the market.
Specifications
- Technology: PMOS, NMOS
- Number of transistors: several thousand
- Clock frequency: 1 MHz traditionally
- Clock cycles per instruction: 5 to 22
- Address space: 64 Kbytes
- Address bus width: 16 bit ( 12 4 bits)
- Data bus width: 8 bit
- Interrupts: several IR
- Commands: 43
- Addressing Modes: several
- Register: usually 8- bit, inter alia, Accumulator (AC ),
- Program counter (Program Counter),
- Pointer register ( PTR),
- Extension register ( E),
- Status register (SR),
- And an additional 3 index registers (P1 to P3)
Periphery
- Cassette Interface
- Sound interface
- Prom -Programmer
Programs for the SC / MP
- Monitor Software " elbug "
- Digital Clock
- Mastermind
- Lunar Lander ( speed and premium on the moon be played through speakers)
- Battleship
- Disassembler
- Keyplay
- Runtext
- Tracer
- NCU
Variants of the SC / MP
The following types of SC / MP processor were offered:
- ISP-8A/500D (INS 8050 ), SC / MP type I in PMOS technology, 2 voltages ( 5 V,- 7V )
- ISP-8A/600 ( INS8060 ), so called SC / MP II in NMOS technology, with higher clock frequency, voltage 1
- INS807x, so called SC / MP III, NMOS technology, with modified instruction set and optional on-chip ROM ( 8073: 2.5 K Tiny BASIC)
The processor is offered in 40 - pin plastic DIP, as well as in ceramic DIP packages.