Words ending with 802
3 letter words ending with 802
- ieee 802 — (networking, standard) The IEEE standards for local area networks. The spanning tree algorithm is defined in IEEE 802.1 (under consideration), Logical Link Control (LLC, the upper portion of the data link layer) in IEEE 802.2, Ethernet in IEEE 802.3, Token Bus in IEEE 802.4 and IBM Token Ring in IEEE 802.5. The equivalent ISO standard is IS 8802.
4 letter words ending with 802
- 1802 — (processor) An 8-bit microprocessor manufactured as CDP1802 by HARRIS Semiconductor. It has been around for ten years at least and is ideally suited for embedded applications. Some of its features are: 8-bit parallel organisation with bidirectional data bus and multiplexed address bus; static design -- no minimum clock rate; bit-programmable output port; four input pins which are directly tested by branch instructions; flexible programmable I/O mode; single-phase clock, with on-chip oscillator; 16 x 16 register matrix to implement multiple program counters, pointers, or registers
- rca 1802 — (processor) An extremely simple microprocessor fabricated in CMOS, running at 6.4 MHz at 10V (very fast for 1974). It could be suspended with the clock stopped. It was an 8-bit processor, with 16-bit addressing. Simplicity was the primary design goal, and in that sense it was one of the first RISC chips. It had sixteen 16-bit registers, which could be accessed as thirty-two 8-bit registers, and an accumulator D used for arithmetic and memory access - memory to D, then D to registers and vice versa, using one 16-bit register as an address. This led to one person describing the 1802 as having 32 bytes of RAM and 65535 I/O ports. A 4-bit control register P selected any one general register as the program counter, while control registers X and N selected registers for I/O Index and the operand for the current instruction. All instructions were 8 bits - a 4-bit op code (total of 16 operations) and 4-bit operand register stored in N. There was no real conditional branching, no subroutine support and no actual stack but these could be implemented by clever use of registers, e.g. changing P to another register allowed jump to a subroutine. Similarly, on an interrupt P and X were saved, then R1 and R2 were selected for P and X until an RTI restored them. The RCA 1805 was an enhanced version. The 1802 was used in the COSMAC (VIP?) microcomputer kit, some video games from RCA and Radio Shack, and the ETI-660 computer. It was chosen for the Voyager, Viking and Galileo space probes as it was also fabricated in Silicon on Sapphire, giving radiation and static resistance, ideal for space operation.
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