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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...
**Notes:
InfoWorld Apr 10, 1989 p42 - Video Severn and G-2 Will Merge to form
Headland Technology.
...affiliate of LSI logic.

According to:
http://www.vgamuseum.info/index.php/news/itemlist/category/15-headland-technology

Graphics chips were renamed from  GC*** to HT***. In this document any
part no. that differs only by  GC/HT have been assumed to be a renamed
part.

**GC101/102     12/16MHz PC/AT Compatible Chip Set             c:Feb88...
**GC101/102/103 12/16MHz PC/AT Compatible Chip Set + EMS 4.0   c:Jul89...
**GCK113        80386 AT Compatible Chip Set                   c:oct89...
**GCK181        Universal PS/2 Chip Set                        c:Mar89...
**HT11          Single 286 AT Chip [no datasheet]               <Aug90...
**HT12/+/A      Single 286 AT Chip with EMS support            c:Aug90...
**HT18          80386SX Single Chip                            c:Sep91...
**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...
**82C898         System/Power Management Controller (non-cache)c:Nov94
***Notes:...
***Info:
Overview
The 82C898 provides a highly integrated solution for fully compatible,
high performance PC/AT platforms. The 82C898 supports 486SX/DX/DX2/DX4
and  P24T  microprocessors  in  the  most  cost  effective  and  power
efficient designs  available today. For  high-end system applications,
this  device offers  optimum  performance for  systems  running up  to
50MHz.  

Based  fundamentally  on  OPTi’s   proven  82C801  and  82C802  design
architectures,  the 82C898 adds  additional memory  configurations and
extensive  power  management  control  for  the  processor  and  other
motherboard components.

The 82C898  supports the latest  in write-back processor  designs from
Intel, AMD, and Cyrix, as well as supporting the AT bus and VESA local
bus  for compatibility  and performance.  It also  includes  an 82C206
Integrated Peripherals Controller (IPC),  all in a single 208-pin PQFP
(Plastic Quad Flat Pack) for low cost.

Power Management
Figure  2-1   [see  datasheet]  exemplifies  the   flexibility  of  an
82C898/82C602-based designs GREEN strategy.  System designs can easily
accommodate both  SLe and non-SLe  CPUs.  If  an Intel non-SLe  CPU is
used, SMI#, SMIAOT#, and FLUSH# are no connects. One design can easily
accommodate  both  types  of   processors  with  minimal  changes  for
upgrades.

***Configurations:...
***Features:...
**
**Support Chips:
**82C601/2       Buffer Devices                                 <Nov94...
**82C822         PCIB (VLB-to-PCI bridge)                         c:94...
**Other:...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
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*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...