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**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94
***Notes:...
***Info:...
***Configurations:...
***Features:...
**
**Later chipsets (basic spec):
**440 series:...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
**800 series...
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*HMC (Hulon Microelectronics)...
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*OPTi...
**82C596/597     PTMAWB Pentium Adaptive Write-back (Cobra)       c:93
***Notes::...
***Info:
The  OPTi design  team  is  proud to  present  the  64-bit Pentium  AT
solution with  VESA Local bus. As  always, the product emphasis  is on
value. The OPTi  PTMAWB is crafted to provide  the highest performance
but most cost effective  system solution without compromising quality,
compatibility or reliability.

The  PTMAWB is a  top-of-the-line solution  for the  server/power user
market. Flexibility of design without using the most expensive support
parts has  been given  key importance. This  ensures the  total system
cost to be  at the high-end 486 level - yet  with the high-end Pentium
performance.

The PTMAWB has  the state-of-the-art AWB cache controller  for up to 2
MB  of Adaptive  Write-back cache  support. The  DRAM  controller also
supports posted writes for faster performance on write cycles.

The  OPTi  PTMAWB-V  provides  PC  servers  and  PC  power  users  the
horsepower of the 64-bit Pentium at 60 MHz and 66 MHz-immediately.


***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)...
**SN74LS610/2 IBM AT: SN74LS610, SN74LS612 Memory Mappers          <84
***Notes:...
***Info:
Each 'LS610  and 'LS612  memory mapper  integrated circuit  contains a
4-line to  16-line decoder, a  16-word by  12-bit RAM, 16  channels of
2-line to 1-line multiplexers, and  other miscellaneous circuitry on a
monolithic chip. Each  'LS610 also contains 12 latches  with an enable
control.

The memory  mappers are designed  to expand a  microprocessor's memory
addressing capability by  eight bits. Four bits of  the memory address
bus (see  System Block Diagram)[see  datasheet] can be used  to select
one of 16 map registers that contain  12 bits each.  these 12 bits are
presented  to the  system memory  address bus  through the  map output
buffers  along with  the  unused  memory address  bits  from the  CPU.
However, addressable memory space  without reloading the map registers
is the  same as would  be available with  the memory mapper  left out.
The  addressable  memory  space  is  increased  only  by  periodically
reloading the  map registers  from the  data bus.   This configuration
lends itself  to memory utilization  of 16 pages of  2^(n-4) registers
each  without reloading  (n -  number of  address bits  available from
CPU).

These  devices have  four modes  of operation:  read, write,  map, and
pass.  Data may be read from  or loaded into the map register selected
by  the register select  inputs (RS0  thru RS3)  under control  of R/W
whenever chip select (CS) is low. The data I/O takes place on the data
bus DO thru D7. The map  operation will output the contents of the map
register selected by the map address  inputs (MA0 thru MA3) when CS is
high and  MM (map mode control)  is low. The 'LS612  output stages are
transparent in this mode, while  the 'LS610 outputs may be transparent
or latched. When CS and MM are both high (pass mode), the address bits
on MA0 thru MA3 appear at M08-MO11, respectively (assuming appropriate
latch control) with  low levels in the other bit  positions on the map
outputs.
***Versions:...
***Features:...
**TACT82000   3-Chip 286 [no datasheet]                            c89...
**TACT82411   Snake  Single-Chip AT Controller                     c90...
**TACT82S411  Snake+ Single-Chip AT Controller [no datasheet]      c91...
**TACT83000   AT 'Tiger' Chip Set (386)                            c89...
**TACT84500   AT Chip Set (486, EISA) [no datasheet, some info]    c91...
**Other:...
*UMC...
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*Western Digital...
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*ZyMOS...
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