Editing List of DOS commands (section)

=== MEMMAKER ===
Starting with version 6,<ref name="RUNNINGMSDOS" /> MS-DOS included the external program MemMaker which was used to free system memory (especially [[Conventional memory]]) by automatically reconfiguring the [[AUTOEXEC.BAT]] and [[CONFIG.SYS]] files. This was usually done by moving TSR programs and [[device driver]]s to the [[Upper memory area|upper memory]]. The whole process required two system restarts. Before the first restart the user was asked whether to enable [[Expanded memory|EMS Memory]], since use of expanded memory required a reserved 64KiB region in upper memory. The first restart inserted the SIZER.EXE program which gauged the memory needed by each TSR or Driver. MemMaker would then calculate the optimal Driver and TSR placement in upper memory and modify the AUTOEXEC.BAT and CONFIG.SYS accordingly, and reboot the second time.<ref>{{cite book | title = Using MS-DOS 6.22 | first = Jim | last = Cooper | publisher = [[Que Publishing]] | page = 455 |  isbn = 0789725738 | date = May 2001 | url = https://books.google.com/books?id=u7oN-5y7nGsC&q=configuring+memory+with+memmaker+cooper&pg=PA455}}</ref>

MEMMAKER.EXE and SIZER.EXE were developed for Microsoft by [[Helix Software Company]] and were eliminated starting in [[MS-DOS 7]] ([[Windows 95]]); however, they could be obtained from Microsoft's FTP server as part of the OLDDOS.EXE package, alongside other tools.

PC DOS uses another program called RamBoost to optimize memory, working either with PC DOS's [[HIMEM]]/[[EMM386]] or a third-party memory manager. RamBoost was licensed to IBM by [[Central Point Software]].