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- CHIPSET.EXE is a small program that simply checks to see if your PC
- has one of the memory controllers required to use The Last Byte
- Memory Manager.
-
- To see if your PC has one of the supported memory controllers, simply
- enter the following command at the DOS prompt and follow the prompts:
-
- A>CHIPSET
-
- If your PC has one of the supported devices, then The Last Byte
- Memory Manager will work on your PC, and you will be able to load
- device drivers, TSRs, DOS buffers and more into upper memory above
- 640k.
-
- If your PC uses another kind of chipset, it may not be supported for
- one of the following reasons:
-
- (1) No shadow ram hardware:
- ---------------------------
-
- Some chipsets do not provide shadow ram support.
-
- Examples: VLSI Technologies 82C100 series
- Western Digital chipsets
- Texas Instruments TACT82300 series
- Early Suntac chipsets (ST62BC001-6)
- United Microelectronics Corp. UM82C231
-
-
- (2) No shadow ram read/write mode:
- ----------------------------------
-
- Some chipsets have shadow ram, but it can only be put into
- either write-only mode (for copying rom contents to ram), or
- read-only mode (to prevent accidental writes into what's
- supposed to be a copy of rom).
-
- Examples: ACC Microelectronics chipsets
- Headland Technologies chipsets
- G2 chipsets
-
-
- (3) DMA (Direct Memory Access) can't get to the shadow ram:
- -----------------------------------------------------------
-
- Many device drivers and TSRs use either use DMA directly, or
- else they employ disk buffers that DOS accesses via DMA.
- The hardware design of some memory controller chips prevent
- DMA from accessing the shadow ram, and thus loading this kind
- of software into shadow ram memory is pointless.
-
- Note: In some cases, a portion of their shadow ram memory may
- be made usable by using the chip's hardware support for
- expanded memory which typically supports DMA. However, this
- precludes use of The Last Byte Memory Manager together with
- an expanded memory manager specifically designed for these
- chips.
-
- Examples: VLSI Technologies VL82C286 & VL82C386 TOPCAT
-
-
- (4) Controller incompatible with design of The Last Byte Memory Manager:
- ------------------------------------------------------------------------
-
- The Last Byte Memory Manager is table-driven, making it
- relatively easy to adapt to different memory controller
- architectures, but there are limits!
-
- Examples: Zymos chipsets
- United Microelectronics Corp. (UM82C384,'388,'389)
- Forex Computer Corp. FRX36C100
- Silicon Integrated System Corp. (SIS) chipsets
-
-
- (5) Shadow ram control can be made inaccessible once configured:
- ----------------------------------------------------------------
-
- Some controllers are designed so that they can be "locked"
- at the end of software initialization, requiring a hardware
- reset to unlock, and thus preventing The Last Byte Memory
- Manager from accessing the controller.
-
- Example: Intel 82335, 82335SX
-
-
- Some of these chips, however, have hardware support for LIM 4.0 EMS,
- and thus many of their motherboards come with a EMS device driver
- designed specifically to take advantage of this capability. So in
- many cases, you can install this driver first, and then The Last Byte
- Memory Manager can use it to manage upper memory.
-
- A free demo version of The Last Byte Memory Manager may be downloaded
- from our BBS at the number below Monday through Friday between 5pm
- and 8am PST, or 24hrs a day on weekends. The filename is
- TLB-Vnnn.ZIP, where the "nnn" is replaced by the latest version
- number. The demo version is fully functional except that it limits
- you to 32k of memory and no more than two device drivers and/or TSRs
- loaded into upper memory.
-
- Key Software Products
- 440 Ninth Avenue
- Menlo Park, CA 94025
- (415) 364-9847
-