8080
8080,
a 8-bit microprocessor from Intel released in April 1974 running at 2 MHz. The 8080 is generally considered to be the first truly usable microprocessor. It had an 8-bit data-bus and 16-bit address-bus, allowing to address 64 KByte of memory, containing program code as well as data (Von Neumann architecture).
Architecture
Register Files
8080 had seven byte-registers: A, B, C, D, E, H, and L. A was the 8-bit accumulator for most arithmetical and logical instructions and the other six could be used as either byte-registers or as three 16-bit register pairs (BC, DE, HL) depending on the particular instruction. HL was also used as (a limited) 16-bit accumulator. It further had a 16-bit stack pointer register and an 16-bit instruction pointer. After a hardware reset ip was cleared zero and started to fetch the first instruction from that address.
Successors
Successor was Intel 8085 in 1977 with same instruction set but required less supporting hardware, and Zilog Z80 [3] .
Endianess
8080 and all it's successors were little-endian machines, concerning the byte-order of 16-bit words in memory.
Software
Operating Systems
Development
Chess Programs
See also
Publications
- Tandy/Radio Shack (1977). 8080-8085 Assembly Language Programming (Intel). Internet Archive
- Kathe Spracklen (1979). Z-80 and 8080 assembly language programming. Hayden Books, amazon.com, Internet Archive
Forum Posts
- Computing from the Old Days, brought back to life by Steven Edwards, CCC, August 16, 2012
External Links
References
- ↑ Die shot of NEC 8080AF microprocessor by Pauli Rautakorpi
- ↑ Intel 8080 from Wikipedia
- ↑ Zilog Z80 from Wikipedia
- ↑ Kathe Spracklen (1979). Z-80 and 8080 assembly language programming. Hayden Books, ISBN: 978-0810451674, amazon.com
- ↑ The Almost Official MIX C for CP/M 80 Museum
- ↑ Floppy Software: List of C Compilers for CP/M
- ↑ ISIS, PL/M and Intel (c)Copyright Herb Johnson 2009 except as quoted remarks
- ↑ Turbo Pascal: A Great Choice For Programming Under CP/M
