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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...
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*SIS...
**5501/5502/5503 Pentium/P54C PCI/ISA Chipset                <04/02/95
***Info:
****General:...
****5501 PCI/ISA Cache Memory Controller (PCMC) ...
****5502 PCI Local Data Buffer (PLDB) 
The SiS5502 PCI Local Data Buffer(PLDB) provides a bi-directional data
buffering among the 64-bit Host  Data Bus, the 64-bit Memory Data Bus,
and  the 32-bit  PCI Address/Data  Bus.  The  PLDB  incorporates three
Posted Write  Buffers and  two Read Buffers  along the bridges  of the
CPU,  PCI  and  Memory  buses.  This  buffering  scheme  smoothes  the
differences  in access  latencies  and bandwidths  among three  buses,
therefore improves  the overall system performance.  A four level/4DWs
deep  write buffer  (CTPPB) provides  buffering  on CPU  write to  PCI
bus. A one level/4QWs deep  write buffer (CTMPB) is used for buffering
write data from  the CPU to Memory. A one  level/1QW deep write buffer
(PTMPB) is  used to  buffer PCI write  to Memory  data. A one  QW Read
Buffer (CRMB) is used to latch CPU  read Memory data and a one QW Read
Buffer (PRMB) is used to latch data in a PCI master read from L2 Cache
or DRAM cycle. During bus  operation between the Host, PCI and Memory,
the PLDB  receives control signals  from the PCMC,  performs functions
such  as  latching data,  forwarding  data  to  destination bus,  data
assemble and disassemble. 

****5503 PCI System I/O (PSIO)...
***Configurations:...
***Features:...
**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...
**UM82C480     386/486 PC Chip Set                                 c91
***Info:...
***Configurations:...
***Features:...
**UM82C493/491 ??????????????? [no datasheet]                        ?...
**UM8498/8496  486 VL Chipset  "Super Energy Star Green"[no dsheet]c94...
**UM8881/8886  HB4 PCI Chipset "Super Energy Star Green"[no dsheet]c94...
**UM8890       Pentium chipset [no datasheet]                        ?...
**
**Support Chips:
**UM82152      Cache Controller (AUStek A38152 clone)              <91...
**UM82C852     Multi I/O For XT                                    <91...
**UM82C206     Integrated Peripheral Controller                    <91...
**UM82c45x     Serial/Parallel chips                                 ?...
**Other chips:...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...