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**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91
***Notes:...
***Info:...
***Features:...
**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...
**HT18          80386SX Single Chip                            c:Sep91
***Info:
The HT18  is an advanced PC/AT compatible,  single-chip 80386SX design
solution. This  highly integrated single chip allows  simple, low cost
system  design options  while  featuring high  performance, low  power
consumption,  and minimum board  space requirements.   Advanced memory
management features  include support  for page mode,  with 2  or 4-way
interleaving  in both pipelined  and non-pipelined  modes(18A/B only).
Extended Hardware EMS  options include dual sets of  32 registers with
multiple context operation. Revisions A/B support 256K and 1M DRAMs in
1 by 1,  1 by 4, and 1  by 9 device configurations. Rev  C supports 4M
devices, as well.  A Shadow RAM  option for System Video BIOS and dual
or single system ROM BIOS support adds to overall design versatility.

A  complete PC/AT  compatible  system with  advanced  features may  be
implemented with minimal external support logic. The HT18 performs all
CPU  and peripheral support  functions in  a single  chip.  Integrated
device  functions include  DMA Controllers,  a Memory  Mapper, Timers,
Counters, Interrupt  Controllers, a Bus Controller  and all supporting
circuitry for PC core logic requirements. An asynchronous AT Bus clock
allows  for a  constant 8MHz  Bus clock  rate for  highest  bus device
compatibility as defined in IEEE Spec P996. This device is packaged in
a 208-pin  Plastic Quad Flat  Pack combining several  external buffers
into this space saving solution.

***Configurations:...
***Features:...
**HT21          386SX/286 Single Chip (20 MHz)                 c:Aug91...
**HT22          386SX/286 Single Chip (25 MHz)                 c:Sep91...
**HT25          3-volt Core Logic for 386SX                    c:Dec92...
**HT35          Single-Chip Peripheral Controller [partial info]     ?...
**HTK320        386DX Chip Set                                 c:Sep91...
**HTK340        "Shasta" 486 Chip Set                          c:Jun92...
**Support Chips:
**HT44          Secondary Cache                                c:Jun92...
**Other:...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
**Later P-Pro/II/III/Celeron
***Notes (Unverified Information!):...
***VT82C691/2BX     Apollo Pro & Pro II           May 98...
***VT82C693         Apollo Pro+                   Dec 98...
***VT82C693A        Apollo Pro 133                Jul 99...
***VT82C694X/MP/Z/A Apollo Pro 133A, 133+ & 133Z  Oct 99...
***VT82C694T        Apollo Pro 133T...
***VT8601           PN133 (ProSavage) (mobile)...
***VT8601/A/T       PM601, PLE133, PLE266 & PLE133T (ProMedia)...
***VT8604/T         PL133 & PL133T (ProSavage)...
***VT8605/6         PM133 & PM133T (ProMedia-II), (ProSavage)
Chips:
[VT8605] (North Bridge) PM133
[VT8606] (North Bridge) PM133T
[VT8231] (South Bridge)
CPUs:          Pentium III, Pentium II, Celeron, Pentium III Tualatin
Bus Speed:     66/100/133 MHz 
DRAM Types:    PC100/PC133 SDRAM, VCSDRAM 
Memory bus:    66/100/133 MHz 
Max Mem:       1.5GB
ECC/Parity:    ?
PCI Bus:       2.1 
AGP speed:     4× (Integrated S3 Graphics Savage4 or external AGP)

Only the PLE133T supports Tualatins.

The ProMedia-II was renamed to the PM133.
  
***VT8607/8         PM266 & PM266T (ProSavageDDR)...
***VT8613           PN266T (mobile)...
***VT8633           Apollo Pro 266                Sep 00...
***VT8653           Apollo Pro 266T & PX-266...
***VT8622/23        CLE266 (mobile)...
***VT????           CM400                         Jan 04...
***Others:...
**Later AMD...
**Other...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...