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**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94
***Notes:...
***Info:
The 82498 Cache Controller and multiple 82493 Cache SRAMs combine with
the Pentium processor (735/90,  815/100) and future Pentium Processors
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 82498 Cache Controller implements the MESI write-back protocol for
full multiprocessing support.  Dual ported buffers and registers allow
the 82498  to concurrently  handle CPU bus,  memory bus,  and internal
cache operation for maximum performance.

The 82493 is a customized high-performance SRAM that supports 64-, and
128-bit  wide memory  bus widths,  32-,  and 64-byte  line sizes,  and
optional sectoring. The  data path between the CPU  bus and memory bus
is  separated  by  the  82493,  allowing  the  CPU  bus  to  handshake
synchronously,  asynchronously,  or   with  a  strobed  protocol,  and
allowing concurrent CPU bus and memory bus operations.

***Configurations:...
***Features:...
**
**Later chipsets (basic spec):
**440 series:...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
**800 series...
*Headland/G2...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
**82C596/597     PTMAWB Pentium Adaptive Write-back (Cobra)       c:93
***Notes::...
***Info:...
***Configurations:...
***Features:...
**82C650/1/2     Discovery (Pentium Pro) [no datasheet]              ?...
**82C681/2/6/7   386/486WB EISA                                   c:92...
**82C683         386/486AWB EISA [no datasheet]                      ?...
**82C693/6/7     Pentium uP Write Back Cache EISA                 c:93...
**82C700         FireStar                                         c:97...
**82C701         FireStar Plus                                    c:97...
**82C750         Vendetta      [no datasheet]                        ?...
**82c801         SCWB2 DX Single Chip Solution                    c:92...
**82C802         SCWB2 PC/AT Single Chip [no datasheet]              ?...
**82C802G/GP     System/Power Management Controller (cached)      c:93...
**82C895         System/Power Management Controller (cached)   c:Sep94...
**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:...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
*VLSI...
*Western Digital...
**WD76C30x   Perip. Ctrl, Interrupt Multiplex, and Clock Gen <11/18/91
***Notes:...
***Info:...
***Versions:...
***Features:
o   Two fully programmable and independent serial I/O ports 
    configurable as PC/AT compatible (WD16C452) or PS/2 
    compatible (WD16C552)
    - Loopback controls for communications link fault isolation for 
      each ACE
    - Line break generation and detection for each ACE
    - Complete status reporting capabilities
    - Generation and stripping of serial asynchronous data control 
      bits (start, stop, parity)
    - Programmable baud rate generator and MODEM control signals for 
      each port
    - Programmable baud rate generator input clock
    - Optional 16 byte FIFO buffers on both transmit and receive of 
      each port for CPU relief during high speed data transfer
    - Programmable FIFO threshold levels of 1 , 4, 8, or 14 bytes on 
      each port
o   Parallel port configurable as a fully Centronics or PS/2 
    compatible, bidirectional parallel port
o   Independently programmable parallel port
o   Interrupt multiplexing logic
    - Selectable multiplexing logic for connecting PC/AT interrupt 
      request lines to the WD76C10 single chip AT controller
o   Clock generation circuitry
    - 80287 coprocessor clock generation
    - WD76C10 and floppy controller clock generation
    - 8042 keyboard clock generation
o   Built-in testability features
o   Hardware or software controllable sleep mode
o   CMOS implementation for high speed and low power requirements 
o   Pulse extension on IRQ inputs
o   84-pin PLCC and PQFP packages

**WD7615     Desktop Buffer Manager                          <04/15/92...
**WD7625     Desktop Buffer Manager                          <10/01/92...
**WD8120LV   Super I/O [no datasheet]                                ?
**Other Chips:...
*Winbond...
*ZyMOS...
*General Sources:...