The Intel 8288 is a bus controller designed for Intel 8086/8087/8088/8089. The chip is supplied in 20-pin DIP package. The 8086 (and 8088) operate in maximum mode, so they are configured primarily for multiprocessor operation or for working with coprocessors. Necessary control signals are generated by the 8288. It was used in the IBM PC, XT and its clones. IBM PC AT used its successor Intel 82288.
Pin assignment and function for the control lines
Name Pin Input (I),Output (O) Function VCC 20
Input power (+5 V) GND 10
Ground (0 V) , , 19, 3, 18 I Status input CLK 2 I Clock
6 I Address Enable CEN 15 I Command Enable IOB 1 I Input/Output Bus Mode
7 O Memory Read Command
9 O Memory Write Command
8 O Advanced Memory Write Command
13 O I/O Read Command
11 O I/O Write Command
12 O Advanced I/O Write Command
14 O Interrupt Acknowledge DT/ 4 O Data Transmit/Receive DEN 16 O Data Enable MCE/ 17 O MCE (if IOB is LOW), (if IOB is HIGH) ALE 5 O Address Latch Enable
Variants
Both Intel 8288 and I8288 (industrial grade) version were available for US$14.30 and $33.75 in quantities of 100 respectively.The 8086 Family: Concepts and realities, Intel Preview Special Issue: 16-Bit Solutions, Intel Corporation, May/June 1980, page 198086 Available for industrial environment, Intel Preview Special Issue: 16-Bit Solutions, Intel Corporation, May/June 1980, page 29 The available 82C88 CMOS version was outsourced to Oki Electronic Industry Co., Ltd.Intel Corporation, "NewsBit: Intel Licenses Oki on CMOS Version of Several Products", Solutions, July/August 1984, Page 1. The package version of Intel 82C88 branded in 20-pin PLCC of sampling at fourth quarter of 1985.Ashborn, Jim; "Advanced Packaging: A Little Goes A Long Way", Intel Corporation, Solutions, January/February 1986, Page 2
References
External links 8288 Bus-Controller data sheet