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**82497/492   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94
***Notes:...
***Info:
The 82497 Cache Controller and multiple 82492 Cache SRAMs combine with
the Pentium processor  (735\90, 810\100) to form a  CPU Cache chip set
designed for high performance servers and function-rich desktops.  The
high-speed interconnect between the  CPU and cache components has been
optimized to  provide zero-wait state  operation. This CPU  Cache chip
set  is fully  compatible with  existing  software, and  has new  data
integrity features for mission critical applications.

The 82497 cache controller implements the MESI write-back protocol for
full multiprocessing support. Dual  ported buffers and registers allow
the 82497  to concurrently  handle CPU bus,  memory bus,  and internal
cache operation for maximum performance.

The  82492 is a  customized high-performance  SRAM that  supports 32-,
64-, 128-bit wide memory bus widths, 16-, 32-, and 64-byte line sizes,
and optional sectoring.  The data path between the  CPU bus and memory
bus  is separated  by the  82492, allowing  the CPU  bus  to handshake
synchronously,  asynchronously,  or   with  a  strobed  protocol,  and
allowing concurrent CPU bus and memory bus operations.

***Configurations:...
***Features:...
**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...
*HMC (Hulon Microelectronics)...
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*SIS...
**530/5595       (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98
***Info:...
***Configurations:...
***Features:...
**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)...
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*Unresearched:...
*VIA...
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**Other:
***VLX*XXX...
***VL16XXX
VL16C450  UART equivalent to VL82C50A but with, scratchpad register, and various improvements
VL16C451  UART equivalent to VL16C450 with Bidirectional Parallel port 
VL16C451B 'Enhanced' UART equivalent to VL16C450 with Bidirectional Parallel port 
VL16C452  2x UART otherwise equivalent to VL16C451
VL16C452B 'Enhanced'2x UART otherwise equivalent to VL16C451
VL16C550 UART same as VL16C450 but with 16 byte FIFO 
VL16C551 UART same as VL16C450 but with 16 byte FIFO (not NSC-compatible?)
VL16C552 UART same as VL16C452 but with 16 byte FIFO
VL16C554 UART same as VL16C552 but Quad
***VL65XXX...
***VL80XXX...
***VL82XXX...
***VL85XXX...
***VL86XXX...
***VXXXXXX...
**Not sure if they actually exist...
*Western Digital...
*Winbond...
*ZyMOS...
*General Sources:...