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**IBM PC/XT/AT Chip Sets
***Datasheets:...
***Read Me:...
***Overview (History):
The original chipsets used by IBM for the PC and XT are based on the
Intel iAPX 88 system. Some additional components are taken from the
MCS-80/85 system. The iAPX 88 system consists of the 8088 CPU and
support chips. It is a modification of the iAPX 86 system (8086 CPU),
with the iAPX 86 having a 16-bit external bus, and the iAPX 88 having
an 8-bit external bus. The iAPX 86 system was formerly known as the
MCS-86 system.
The chips used in Both the PC/XT and the AT were introduced by Intel
at various different times over approximately a decade between 1975
and 1984. In addition there are various different revisions of a
particular chip. Due to these differences, relying on a datasheet from
a particular year alone, is insufficient. So for a particular chip,
differences between the datasheets are noted. This information can be
found in the ****Notes section of each chip. The information from the
datasheets, quoted in this document, is not the complete datasheet.
The actual datasheet contains more information. This is done for
brevity.
Also included is information about forerunners of chips used by the
IBM systems. For example, the 8255 (forerunner to the 8255A) has been
included. At a bit more of a stretch, the 8257 (essentially a
forerunner to the 8237) has also been included.
***Summary of sections:...
***§1: Intel MCS-8x/iAPX Microprocessor families:...
***§2: Intel Chip Specifications 1975 - Jan 1982:...
***§3: IBM PC/XT: Original system chips: ...
***§4: Intel Chip Specifications Jan 1982 - Jan? 1984...
***§5: IBM AT: Original system chips:...
***§6: Intel Chip Specifications Jan? 1984 - 1989...
**82230/82231 High Integration AT-Compatible Chip Set(ZyMOS) c:Aug88...
**82310 Micro Channel Compatible Peripheral Chip Set 04/21/88...
**82311 High Integration MCA Compatible Perip. Chip Set 11/14/88...
**82320 MCA compatible Chipset [no datasheet] 04/10/89...
**82340DX Chip Set (VLSI) (82346/82345/82355) 01/08/90...
**82340SX Chip Set (VLSI) (82343/82344) 01/25/89...
**82350 EISA Chip Set 07/10/89...
**82350DT EISA Chip Set 04/22/91...
**82420TX/ZX PCIset (for 486) TX (Saturn), ZX (Saturn II) c:Nov92...
**82420EX PCIset (for 486) EX (Aries) (82425EX/82426EX) <Dec94...
**82430LX PCIset (Pentium) LX (Mercury) (82433LX/82434LX) 03/22/93...
**82430NX PCIset (Pentium) NX (Neptune) (82433NX/82434NX) Mar94...
**82430FX PCIset (Pentium) FX (Triton I) (82437FX/82438FX)01/31/95...
**82430MX PCIset (Pentium) MX (Mobile Triton)(82437/438MX)11/01/95...
**82430HX PCIset (Pentium) HX (Triton II) (82439HX) 02/12/96...
**82430VX PCIset (Pentium) VX (Triton II) (82437VX/82438) 02/12/96...
**82430TX PCIset (Pentium) TX (Triton II) (82439TX) 02/17/97...
**82450KX/GX PCIset (Pentium Pro) KX/GX (Mars/Orion) 11/01/95...
**
**Support Chips:
**82091AA Advanced Interface Peripheral (AIP) c93...
**8289 Bus Arbiter (808x) c79...
**82289 Bus Arbiter for iAPX 286 Processor Family c83...
**82258 Advanced Direct Memory Access Coprocessor(ADMA) 01/01/84...
**82335 High-Integration Interface Device For 386SX c:Nov88...
**82360SL I/O Subsystem 10/05/90...
**82370 Integrated System Peripheral (for 82376) c:Oct88...
**82371FB/SB PCI ISA IDE Xcelerator 82371FB/82371SB (PIIX/3) 01/31/95...
**82371MX Mobile PCI I/O IDE Xcelerator (MPIIX) 11/01/95...
**82371AB PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4) 02/17/97
***Notes:...
***Info:...
***Versions:...
***Features:
o Supported Kits for both Pentium and Pentium II Microprocessors
- 82430TX ISA Kit
- 82440LX ISA/DP Kit
o Multifunction PCI to ISA Bridge
- Supports PCI at 30 MHz and 33 MHz
- Supports PCI Rev 2.1 Specification
- Supports Full ISA or Extended I/O (EIO) Bus
- Supports Full Positive Decode or Subtractive Decode of PCI
- Supports ISA and EIO at 1/4 of PCI Frequency
o Supports both Mobile and Desktop Deep Green Environments
- 3.3V Operation with 5V Tolerant Buffers
- Ultra-low Power for Mobile Environments Support
- Power-On Suspend, Suspend to RAM, Suspend to Disk, and Soft-
OFF System States
- All Registers Readable and Restorable for Proper Resume
from 0.V Suspend
o Power Management Logic
- Global and Local Device Management
- Suspend and Resume Logic
- Supports Thermal Alarm
- Support for External Microcontroller
- Full Support for Advanced Configuration and Power Interface
(ACPI) Revision 1.0 Specification and OS Directed Power
Management
o Integrated IDE Controller
- Independent Timing of up to 4 Drives
- PIO Mode 4 and Bus Master IDE Transfers up to 14 Mbytes/sec
- Supports "Ultra DMA/33" Synchronous DMA Mode Transfers up to
33 Mbytes/sec
- Integrated 16 x 32-bit Buffer for IDE POI Burst Transfers
- Supports Glue-less "Swap-Bay" Option with Full Electrical
Isolation
o Enhanced DMA Controller
- Two 82C37 DMA Controllers
- Supports PCI DMA with 3 PC/PCI Channels and Distributed DMA
Protocols (Simultaneously)
- Fast Type-F DMA for Reduced PCI Bus Usage
o Interrupt Controller Based on Two 82C59
- 15 Interrupt Support
- Independently; Programmable for Edge/Level Sensitivity
- Supports Optional I/O APIC
- Serial Interrupt Input
o Timers Based on 82C54
- System Timer, Refresh Request, Speaker Tone Output
o USB
- Two USB 1.0 Ports for Serial Transfers at 12 or 1.5 Mbit/sec
- Supports Legacy Keyboard and Mouse Software with USB-based
Keyboard and Mouse
- Supports UHCI Design Guide
o SMBus
- Host Interface Allows CPU to Communicate Via SMBus
- Slave Interface Allows External SMBus Master to Control
Resume Events
o Real-Time Clock
- 256-byte Battery-Back CMOS SRAM
- Includes Date Alarm
- Two 8-byte Lockout Ranges
o Microsoft Win95 Compliant
o 324 mBGA Package
**82374/82375 PCI-EISA Bridge (82374EB/82375EB, 374SB/375SB) c:Mar93...
**82378 System I/O (SIO) (82378IB and 82378ZB) c:Mar93...
**82379AB System I/O-APIC (SIO.A) <Dec94...
**82380 32-bit DMA Controller w/ Integrated Peripherals 02/01/87...
**82380FB/AB PCIset: 82380FB Mobile PCI-to-PCI Bridge(MPCI2) 02/17/97...
**82384 Clock Generator and Reset Interface c86...
**82385 32-bit Cache Controller for 80386 09/29/87...
**82385SX 32-bit Cache Controller for 80386SX 01/25/89...
**82395DX High Performance Smart Cache 06/18/90...
**82395SX Smart Cache 12/17/90
***Notes:...
**82396SX Smart Cache 12/17/90...
**82485 Turbo Cache (and 485Turbocache) c90...
**82489DX Advanced Programmable Interrupt Controller 10/12/92...
**82495DX/490DX DX CPU-Cache Chip Set <Sep91...
**82495XP/490XP Cache Controller / Cache RAM (for i860) 06/05/91...
**82496/491 Cache Controller / Cache RAM (for P5 Pentium) 03/22/93...
**82497/492 Cache Controller / Cache RAM (for P54 Pentium) <Nov94...
**82498/493 Cache Controller / Cache RAM (for P54 Pentium) <Nov94...
**
**Later chipsets (basic spec):
**440 series:...
**450NX (?) 06/29/98:...
**????? (Profusion) c:99...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
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*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
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*TI (Texas Instruments)...
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*Unresearched:...
*VIA...
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*ZyMOS...
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