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**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:
o   100% IBM PC/AT compatible
o   Supports 80386 CPU running at 25/33/40 MHz
o   Supports 80486 CPU running at 25/33/40/50 MHz in 1x clock
o   Supports Intel 80387 / Weitek 3167 / Weitek 4167 Floating Point 
    Coprocessors
o   Built-in cache controller:
    - Direct-mapped organization with write-back operation
    - 0 wait state for cache hit
    - Flexible cache size: 32/64/128/256/512/1024 KB
    - Hidden DRAM refresh to boost system performance
    - built-in registers to support three independent non-cacheable 
      regions
    - Support cache line fill as well as 80486 burst mode
    - Support Automatic Memory Size Detection
o   Sophisticated DRAM controller:
    - Supports Fast/Standard page mode
    - Supports 4 banks CPU speed DRAM with memory size up to 64MB
    - Supports mixable 256Kx9, 1Mx9, 4Mx9 DRAM modules
    - Programmable DRAM wait states
    - Supports 256KB or 384KB (A to F segments of first 1MB) 
      relocation to the top of DRAM memory
o   Supports sophisticated Shadow RAM for video and system BIOS (C, D,
    E, F segments)
o   Supports first GATE A20 and fasy CPU RESET to optimize OS/2 
    operations
o   Synchronous AT bus clock with programmable clock (divided by 2, 3,
    4, 5, 6)
o   Programmable CPU clock (divided by 1, 2, 3, 4)
o   Support 256KB/512KB/1MB EPROMs with single or double EPROM BIOS 
    configuration

**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:...
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