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**IBM AT: MC146818 Real Time Clock <84
***Info:...
***Versions:...
***Features:
o Low-Power, High-Speed, High-Density CMOS
o Internal Time Base and Oscillator
o Counts Seconds, Minutes, and Hours of the Day
o Counts Days of the Week, Date, Month, and Year
o 3 V to 6 V Operation
o Time Base Input Options: 4.194304 MHz, 1.048576 MHz, or 32,768 kHz
o Time Base Oscillator for Parallel Resonant Crystals
o 40 to 200 uW Typical Operating Power at Low Frequency Time Base
o 4.0 to 20 mW Typical Operating Power at High Frequency Time Base
o Binary or BCD Representation of Time, Calendar, and Alarm
o 12- or 24-Hour Clock with AM and PM in 12-Hour Mode
o Daylight Savings Time Option
o Automatic End of Month Recognition
o Automatic Leap Year Compensation
o Microprocessor Bus Compatible [this means absolutely nothing]
o MOTEL Circuit for Bus Univerality
o Multiplexed Bus for Pin Efficiency
o Interfaced with Software as 64 RAM Locations
o 14 Bytes of Clock and Control Registers
o 50 Bytes of General Purpose RAM
o Status Bit Indicates Data Integrity
o Bus Compatible Interrupt Signals (IRQ)
o Three Interrupts are Separately Software Maskable and Testable
Time-of-Day Alarm, Once-per-Second to Once-per-Day
Periodic Rates from 30.5 us to 500 ms
End-of-Clock Update Cycle
o Programmable Square-Wave Output Signal
o Clock Output May Be Used as Microprocessor Clock Input
At Time Base Frequency /1 or /4
o 24-Pin Dual-In-Line Package
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
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*UMC...
**UM82C*** (IBM/INTEL Direct replacement) c87
Note: Dates vary for when these chips were first available. Two
databooks have been used one from '86 the other from '91. Not all the
chips are listed in the '86 databook, the date of '87 is an
assumption.
PC/XT:
IBM: UMC: Desc:
Intel 8284 UM82C84A 25MHz CMOS Clock Generator and Driver
Intel 8288 UM82C88 Bus Controller
Intel 8259 UM8259A Programmable Interrupt Controller also UM82C59A-2 (CMOS version)
Intel 8237 UM8237A 3-5MHz Programmable DMA Controller (DMAC)
Intel 8253 UM8253*2 2.6-5MHz Programmable Interval Timer
Intel 8255 UM82C55A* Programmable Peripheral Interface
Note: * indicates: possible compatibility, datasheet does not state
explicitly. YMMV.
Note: *2 indicates: The UM8253 can be replaced with the
UM82C54/-2. The datasheet says it is a superset of the 8253, and
works up to 10MHz. Also it's compatible with the 8254. AT: IBM:
UMC: Desc: Intel 82284 UM82C284* 10-12.5MHz Clock Generator and
Ready Interface Intel 82288 UM82C288* 10-12.5MHz Bus Controller
Intel 8254 UM82C54/-2 8-10MHz CMOS Programmable Interval Timer
Intel 8259 UM8259A Programmable Interrupt Controller also
UM82C59A-2 (CMOS version) Intel 8237 UM8237A 3-5MHz Programmable
DMA Controller (DMAC) 74LS612 UM74HCT612* Memory Mapper MC146818
RTC UM82C6818* Real-Time Clock (RTC) Intel 8047 ?? Keyboard
Controller
Note: * indicates: possible compatibility, datasheet does not state
explicitly. YMMV.
**UM82C088 PC/XT Integration Chip <91...
**UM82C230 286AT MORTAR Chip Set <91...
**UM82C210 386SX/286 AT Chip Set <91...
**UM82C3xx Twinstar & UM82C336F/N & UM82C39x [no datasheet] ?...
**UM82C380 386 HEAT PC/AT Chip Set <91...
**UM82C480 386/486 PC Chip Set c91
***Info:...
***Configurations:...
***Features:...
**UM82C493/491 ??????????????? [no datasheet] ?...
**UM8498/8496 486 VL Chipset "Super Energy Star Green"[no dsheet]c94...
**UM8881/8886 HB4 PCI Chipset "Super Energy Star Green"[no dsheet]c94...
**UM8890 Pentium chipset [no datasheet] ?...
**
**Support Chips:
**UM82152 Cache Controller (AUStek A38152 clone) <91...
**UM82C852 Multi I/O For XT <91...
**UM82C206 Integrated Peripheral Controller <91
***Info:...
***Versions:...
***Features:...
**UM82c45x Serial/Parallel chips ?...
**Other chips:...
*Unresearched:...
*VIA...
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*Winbond...
*ZyMOS...
*General Sources:...
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