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- WHAT'S NEW IN VERSION 1.17
- --------------------------
-
- - Added support for Expanded Memory as an alternative to a memory
- controller chip; added the "EMS3", "EMS4", "EEMS", and "NOFRAME"
- override options to the command line options.
-
- - Now any 386sx, 386, or 486 can use LASTBYTE, even if you don't have
- the "necessary" hardware! Simply use the Windows 3.0 version of
- EMM386.SYS to implement Expanded Memory, and then use it to install
- LASTBYTE:
-
- DEVICE=EMM386.SYS
- DEVICE=LASTBYTE.SYS
-
- If you don't need expanded memory for any other reason, then add
- the following command line options:
-
- DEVICE=EMM386.SYS 176
- DEVICE=LASTBYTE.SYS NOFRAME
-
- "NOFRAME" basically disables further use of Expanded Memory so that
- TSR's and device drivers may be stored in the expanded memory page
- frame without fear of being swapped out by other software. The
- number 176 limits the size of Expanded Memory to 176kb. The actual
- number may vary on your machine, but it is a way to use no more
- Extended Memory for LASTBYTE than the minimum required.
-
-
- * * * IMPORTANT * * *
-
- The NOFRAME option is intentionally enabled for EMS4 and
- EEMS (as well as for EMS3) in this release as a temporary
- solution to a problem that occurs when these options are
- used in conjunction with certain programs that use expanded
- memory. This limitation will be eliminated in the next
- release.
-
-
- - Modified bandwidth measurement routine to repeatedly read first 4
- bytes of target area rather than reading the first 1KB. Some disk
- controllers with memory-mapped i/o were apparently intolerant of the
- latter approach, causing the system to hang on boot.
-
- - Modified read/write test of chips and ram memory to be less invasive.
-
- - Modified the memory allocation algorithm for EMS page frame and
- TSR markers are placed at the top of an available block rather than
- the bottom, like ram disk memory and EMS pages.
-
- - Added a "?" option to the CHIPSET command line to display the list
- of supported devices.
-
- - Added support for Texas Instruments Single-Chip TACT82411. This
- chip is "functionally" equivalent to the Chips and Technologies
- NEAT chipset, but unlike the latter, most of the configuration
- registers in the TI device are write-only. This causes the
- automatic detection of a NEAT chipset to fail, and requires using
- the "82411" override option on the LASTBYTE.SYS command line.
-
- - Repaired a bug in the hardware signature computation where it tests
- for the presence of a numeric coprocessor. This bug would
- sometimes cause a PC to hang, either when running the LICENSE.EXE
- program or when installing LASTBYTE.SYS during the processing of
- CONFIG.SYS.
-
- - Repaired several bugs having to do with support of the VLSI
- Technologies 82C202 chip.
-
-