What manages Upper Memory Blocks (UMBs) in MS-DOS?
2019年10月31日 · I had always assumed that EMM386.EXE was responsible for managing the Upper Memory Blocks - UMBs - the memory space between 640KiB and 1MiB in real mode …
How did DOS know where to load itself in upper memory?
Typical 386+ DOS installations use EMM386 or a similar memory manager to map memory using the 386’s paging features (in V86 mode). Another approach, which works with 286-class …
ms dos - Why did programmers keep using EMS when XMS …
2025年2月11日 · The EMM386 may be a requirement for some other purposes too. For example the Gravis UltraSound sound card could be made to emulate a Sound Blaster and a Roland …
Figuring out size of Device Drivers and where they are loaded in …
2019年2月22日 · himem.sys emm386.exe ansi.sys sbide.sys ctmouse.exe smartdrv.exe doskey.com mscdex.exe I'm loading all these devices (including part of DOS itself) into High …
Why did DOS-based Windows require HIMEM.SYS to boot?
2023年5月1日 · Another interesting scenario may be that windows used the big real mode during startup - that mode is set up by himem.sys if it itself was started in real mode. (of course this …
Why HIMEM was implemented as a DOS driver and not a TSR
2024年8月15日 · Rather, they try to allocate memory from the UMA ("upper memory"). DOS technically uses the XMS interface to access UMBs but HIMEM type drivers generally have …
DOS networking (Ethernet) - Retrocomputing Stack Exchange
Telling EMM386 to reserve some memory space for the enabler, with a line in your CONFIG.SYS like: DEVICE=C:\EMM386.EXE NOEMS X=D000-D3FF. Running the enabler when you boot …
Why did "protected-mode MS-DOS" never happen?
2023年1月23日 · The EMM386 mainly handles the memory mapping to provide rest of the memory as EMM to the virtual 86 mode task. If you don't use EMM386 or similar manager, but …
How do I create a boot menu to select between Windows and DOS?
2018年6月21日 · the memory manager: HIMEM.SYS only (for games which wouldn’t work with a V86 memory manager), EMM386.EXE with or without EMS (without EMS, you’d get 64K more …
ms dos - What's the difference between the DOS HIMEM.SYS and …
2019年11月5日 · EMM386 supports a different range of interrupts etc, that Lotus, Intel and Microsoft agreed on. Like HIMEM, there are programs that support this, and it involves a bit of …