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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...
**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...
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*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
**85C496/497 486-VIP 486 Green PC VESA/ISA/PCI Chipset <95
***Info:
The SiS 486-VIP (VESA/ISA/PCI) chips are two-chip solution ideally for
Intel's 80486, SL Enhanced 486, P24D/P24T/DX4 CPU, AMD's 486, Enhanced
Am486 and Cyrix's Cx486 (M7)/Cx 5x86 CPU based on green AT system. By
supporting the most popular industrial standard system interfaces, it
provides flexible configurations for system design and applications.
The SiS85C496 PCI & CPU Memory Controller (PCM) integrates the Host
Bridge (Host Interface), the cache and main memory DRAM Controller,
the PCI Bridge, the built-in IDE Controller, and the FS-Link Bus (Fast
Slow Link Bus). It provides the address paths and bus control for
transfers among the Host (CPU/L1 cache), main memory (L2 cache and
DRAM), the Peripheral Component Interconnect (PCI) Bus, and the
FS-Link Bus. The L2 cache controller supports both write-through and
write-back cache policies and cache sizes up to 1 MBytes. The cache
memory can be built using standard asynchronous SRAMs. The main
memory DRAM controller interfaces DRAM to the Host Bus, PCI Bus, and
FS-Link Bus. Up to eight single sided SIMMs or four double sided SIMMs
provide a maximum of 255 MBytes of main memory. The installation of
DRAM SIMMs is "Table-Free", which allows the SIMMs be installed into
any slot location and any combinations. The built-in IDE hard disk
controller allows CPU accessing hard disk and also provides higher
system integration with lower system cost. The 85C496 is intended to
be used with the SiS85C497 which is a AT Bus Controller with built-in
206 controller.
The SiS85C497 AT Bus Controller and Megacells (ATM) provides the
interface between PCI/CPU/Memory Bus (fast machine) and the ISA Bus
(slow machine). It also integrates many of the common I/O functions
in today's ISA based PC systems. The 85C497 comprises the FS-Link
interface (Fast-Slow Link interface), ISA bus controller , DMA
controller and data buffers to isolate the FS-Link Bus from the ISA
Bus and to enhance performance. It also integrates a 14 channel
edge/level interrupt controller, refresh controller, a 8-bit BIOS
timer, three programmable timer/counters, non-maskable-interrupt (NMI)
control logic, Power Management Unit, and RTC. Figure 1 .1 [see
datasheet] shows the system block diagram.
***Configurations:...
***Features:...
**85C501/502/503 Pentium/P54C PCI/ISA Chipset <01/09/95...
**5101/5102/5103 Pentium/P54C PCI/ISA Chipset <04/02/95...
**5120 Pentium PCI/ISA Chipset (Mobile) <01/28/97...
**5501/5502/5503 Pentium/P54C PCI/ISA Chipset <04/02/95...
**5511/5512/5513 Pentium PCI/ISA <06/14/95...
**5571 (Trinity) Pentium PCI/ISA Chipset (75MHz) <12/09/96...
**5581/5582 (Jessie) Pentium PCI/ISA Chipset (75MHz) <04/15/97...
**5591/5592/5595 (David) Pentium PCI A.G.P. Chipset <01/09/98...
**5596/5513 (Genesis) Pentium PCI Chipset <03/26/96...
**5597/5598 (Jedi) Pentium PCI/ISA Chipset <04/15/97...
**530/5595 (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98...
**540 (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99...
**55x SoC (System-on-chip) <03/14/02...
**
**Support chips:
**85C206 Integrated Peripheral Controller [no datasheet] ?...
**5595 Pentium PCI System I/O <12/24/97...
**950 LPC I/O <07/16/99...
**Other:...
**PII/III/Pro...
**Athlon etc...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
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*ZyMOS...
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