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**82420TX/ZX PCIset (for 486) TX (Saturn), ZX (Saturn II) c:Nov92
***Notes:
Date source: 82420 (nov92).pdf
Originally known as the 82420 chipset
Information taken from: 82420 (nov92).pdf
82420_PCIset_ISA_and_EISA_Bridges_Mar93.pdf
Intel_Peripheral_Components_1994.pdf*
82424ZX (nov94).pdf, 82420 (nov94).pdf
(Errata:1) http://support.intel.com/support/chipsets/420/8510.htm**
(Errata:2) http://support.intel.com/support/chipsets/420/8511.htm**
(Errata:3) http://support.intel.com/support/chipsets/420/8512.htm**
(Errata:4) http://support.intel.com/support/chipsets/420/8513.htm**
(Errata:5) http://support.intel.com/support/chipsets/420/apptech.htm**
>* General 82420 datasheet, 82423 and 82424 all dated Oct'93.
>** see archived sources at the end of this section
Differences:
Nov'92 to Mar'93:
The Mar'93 datasheet (Both only include the general section) has a
completely restructured Info and Features section. The main func-
tional difference is that in the Nov'92, no PCI-EISA bridge version
is available. The Mar'93 is the earliest datasheet found that
mentions the 82374/82375 EISA components.
Mar'93 to Oct'93:
The Mar'93 datasheet refers to the 82424TX component directly, the
Oct'93 to just 82424. Same with 82423TX and 82423. This is due to
the datasheet specifying both the TX and ZX variants of both chips.
A similar thing occurs with the 82378IB and 82378. In Oct'93 there
were IB and ZB variants. Other differences are shown in the text.
The Mar'93 source only includes the general section. In Oct'93, both
datasheets found for the specific chips are only short 1-2 pages
long.
In Errata:1, more specifics are given, that partially contradict the
Oct'93 datasheet. Dated Aug'93 the following differences are given:
"
82424TX * Name change from 82424TX to 82424ZX
Changes: * ZX eliminates all known TX errata
* Features/Enhancements include: Extra RAS line supports
additional memory, Optional memory locations for SMM,
external work-around logic for TX eliminated
Timing:
We anticipate production shipments...in October 1993 for the
82424ZX. "
Errata:2 gives further details. The document itself is undated, but
Errata:1 is hyperlinked to it. Its text is quoted in the Versions
section. Errata:3 & 4 go into further detail.
All Errata documents contradict the Oct'93 datasheet, by making no
mention of the 82423ZX variant.
Oct'93 to Nov'94:
In the Nov'94 datasheet specific variants are now referred to again.
All references to 82424 are replaced with 82424ZX, 82378 replaced
with 82378ZB. The 82423 is replaced with 82423TX again. It appears
the 82423ZX variant either no longer exists, or the Oct'93 datasheet
refers to a chip that was planned, but never introduced. As the
Oct'93 datasheet for the 82423 specific chip is only a part data-
sheet (1-2 pages), it has been impossible to determine what the
differences are between the ZX and TX variants, or even if the ZX
variant actually existed. It simply states there are differences.
The specific datasheet for the 82424 now only refers to the ZX
variant. the ZX-50 variant is not mentioned. Other changes between
the datasheets are shown in the text.
Errata:5 contains links to additional information, some related to
this chipset.
Archived sources:
http://web.archive.org/web/20000816013859/http://support.intel.com/support/chipsets/420/8510.htm
http://web.archive.org/web/20000816013854/http://support.intel.com/support/chipsets/420/8511.htm
http://web.archive.org/web/20000818162626/http://support.intel.com/support/chipsets/420/8512.htm
http://web.archive.org/web/20000818162634/http://support.intel.com/support/chipsets/420/8513.htm
http://web.archive.org/web/19990421055226/http://support.intel.com/support/chipsets/420/apptech.htm
***Info:...
***Versions:...
***Configurations:...
***Features:...
**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...
**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:
***440FX (Natoma) 05/06/96...
***440LX (Balboa) 08/27/97...
***440BX (Seattle) c:Apr'98...
***440DX (?) c:?...
***440EX (?) c:Apr'98...
***440GX (Marlinespike) 06/29/98...
***440ZX & 440ZX-66 (?) 01/04/99...
***440ZX-M (?) 05/17/99...
***440MX (Banister) 05/17/99...
**450NX (?) 06/29/98:...
**????? (Profusion) c:99...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
**82C895 System/Power Management Controller (cached) c:Sep94
***Notes:...
***Info:...
***Configurations:...
***Features:
o Processor interface:
- Intel 80486SX, DX, DX2, SLe, DX4, P24T, P24D
- AMD 486DX, DX2, DXL, DXL2, Plus
- Cyrix DX, DX2, M7
- CPU frequencies supported 20, 25, 33, 40 and 50MHz
o Cache interface:
- Direct Mapped Cache
- Two banks interleaved or single bank non-interleaved
- 64, 128, 256 and 512K cache sizes
- Programmable wait states for L2 cache reads and writes
- 2-1-1-1 read burst and zero wait state write @ 33MHz
- No Valid bit required
- Supports CPUs with L1 write-back support
o DRAM interface:
- Up to 128MB main memory support
- Supports 256KB, 1MB, 4MB, and 16MB single- and double-sided SIMM
modules
- Read page-hit timing of 3-2-2-2 at 33MHz
- Supports hidden, slow and CAS-before-RAS refresh
- Four RAS lines to support four banks of DRAM
- Programmable wait states for DRAM reads and writes
- Enhanced DRAM configuration map
o Power management:
- Support for SMM (System Management Mode) for system power
management implementations
- Programmable power management
- Programmable wake-up events through hardware, software and
external SMI source
- Multiple level GREEN support (NESTED_GREEN)
- STPCLK# protocol support
- One programmable GREEN event timer
o ISA interface:
- 100% IBM PC/AT ISA compatible
- Integrates DMA, timer and interrupt controllers
- Optional PS/2 style IRQ1 and 12 latching
o VESA VL interface:
- Conforms to the VESA v2.0 specification
- Optional support for up to two VL masters
o Miscellaneous features:
- Full support for shadow RAM, write protection, L1/L2
cacheability for video, adapter and system BIOS
- Enhanced arbitration scheme
- Transparent 8042 emulation for fast CPU reset and GATEA20
generation
o Packaging:
- Higher integration
- Reduced TTL count
- Low-power, high-speed 0.8-micron CMOS technology
- 208-pin PQFP (Plastic Quad Flat Pack)
**82C898 System/Power Management Controller (non-cache)c:Nov94...
**
**Support Chips:
**82C601/2 Buffer Devices <Nov94...
**82C822 PCIB (VLB-to-PCI bridge) c:94...
**Other:...
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*TI (Texas Instruments)...
*UMC...
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*VIA...
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*Winbond...
*ZyMOS...
*General Sources:...
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