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**82C599    PCI-VLB Bridge [no datasheet, some info]                 ?

82C599 PCI-VLB Bridge referenced in:
http://web.mit.edu/netbsd/src/sys/dev/pci/pcidevs

from:
https://web.archive.org/web/20050313090427/http://www.os2forum.or.at/english/info/os2hardwareinfo/pci_chips.html

"The Contaq Chipset (Contaq: 1080/4224) (8/27/95)

The Contaq 82C599  is paired with one of  their 486VL chipsets (82C596
or  82C597) and  bridges directly  from the  486 CPU  to the  PCI bus.
Paraphrased from the Contaq spec.:

The  82C596 system  controller provides  the CPU  interface,  VESA bus
interface, ISA bus controller, etc. The 82C599 PCI controller provides
the bridge  between PCI master/slave  agent and the  ISA/VESA standard
expansion  bus; it arbitrates  all the  bus transactions  between host
CPU, PCI agent, VESA device, and ISA device.

(Which sounds to me like the PCI bus is attached to the VL bus, rather
than to the CPU, which will cause PCI performance degradation.)"

**82C693    PCI-ISA Bridge [no datasheet]                            ?...
*Efar Microsystems [no datasheets, some info]...
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*Forex . . . . . . [List only, no datasheets found]...
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**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91
***Notes:...
***Info:...
***Configurations:...
***Features:...
**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91...
**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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**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
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