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**ACC82021   Turbo PC/AT Chip Set (286/386SX 25MHz Max)            >88
***Notes:
The datasheet  for this chip set  only gives the general  section. The
2121  chip  has  a  separate  datasheet.  The  2000  and  2220  chip's
information is sourced from the ACC82020 datasheet.

The main difference between the  ACC82020 and the ACC82021 is that the
ACC82021  uses the  ACC2121  System/Memory controller  instead of  the
ACC2120.  

The  ACC2120 chip  lists some  features as  "Available fourth  quarter
1989". It would appear that nearly all the features listed in this way
are now in the ACC2121. Perhaps the ACC2120 chip was never updated and
instead replaced by the ACC2121.

Other features in the general section that differ are:

Differences:
Video BIOS shadowed
Lists Chip select for floppy instead of mouse


***info:...
***Configurations:...
***Features:...
**ACC82300   386 AT Chip Set (386DX)                               c88...
**ACC82C100  Single-Chip PC/XT Systems-Controller                  c90...
**ACC83000   Model 30 Integrated Chip Set (MCA)                    c88...
**ACC85000/A Model 50/60 Chipset (MCA)                             c88...
**ACC1000    Turbo PC/XT Integrated Bus and Peripheral Ctrl.  04/02/88...
**ACC2036    Single Chip Solution 2036 (286/386SX)              <Jul92...
**ACC2046/ST 486DX/486SX/386DX Single Chip AT                   <Jul92...
**ACC2048    WB 486 Notebook/Embedded Single Chip [no datasheet]     ?...
**ACC2051/NT PCI Single Chip Solution for Notebook Applications    c96...
**ACC2056    ?Pentium 3.3V Notebook               [no datasheet]<Jan96...
**ACC2057    PCI Notebook/Embedded Single Chip    [no datasheet]<Aug96...
**ACC2066NT  486 Notebook/Embedded Single Chip    [no datasheet]     ?...
**ACC2086    486 VL-based System Super Chip Soluti[no datasheet]     ?...
**ACC2087    Enhanced Super Chip (486 Single Chip)              <Aug96...
**ACC2089    486 PCI-based System Super Chip      [no datasheet]     ?...
**ACC2168/GT 32-bit 486 Green System Single Chip  [no datasheet]     ?...
**ACC2178A   32-bit 486 Green System Single Chip  [no datasheet]     ?...
**ACC2268    ?486                                 [no datasheet]     ?...
**ACC????    Maple/Maple-133 486-System-On-Chip   [no datasheet]     ?...
**
**Support Chips:
**ACC2016    Buffer and MUX Logic                                  c96...
**ACC2020    Power Management Chip                                 c92...
**ACC5500    Multifunction I/O Control Chip for PS2 Model 50/60    c88...
**
**Other chips...
*ALD...
*ALi...
*AMD . . . . . . . [no datasheets, some info]...
*Chips & Technologies...
*Contaq  . . . . . [no datasheets, some info]...
*Efar Microsystems [no datasheets, some info]...
*ETEQ...
*Faraday...
*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**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...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
**IBM AT: MC146818 Real Time Clock                                 <84
***Info:
The MC146818  Real-Time Clock  plus RAM is  a peripheral  device which
includes   the   unique   MOTEL   concept   for   use   with   various
microprocessors,  microcomputers,  and  larger computers.   This  part
combines  three unique  features:  a complete  time-of-day clock  with
alarm and one hundred year calender, a programmable periodic interrupt
and square-wave generator,  and 50 bytes of low-power  static RAM. The
MC146818  uses high-speed  CMOS  technology to  interface  with 1  MHz
processor busses, while consuming very little power.

The  Real-Time Clock  plus RAM  has two  distinct uses.  First,  it is
designed  as a  battery powered  CMOS part  (in an  otherwise NMOS/TTL
system) including  all the common battery backed-up  functions such as
RAM, time,  and calendar.  Secondly, the  MC146818 may be  used with a
CMOS  microprocessor  to  relieve  the  software  of  the  timekeeping
workload  and to  extend  the available  RAM  of an  MPU  such as  the
MC146805E2
***Versions:...
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