[syslinux] Memdisk and big floppy images

d tbsky tbskyd at gmail.com
Fri Jul 6 01:33:02 PDT 2018

2018-06-26 2:10 GMT+08:00 H. Peter Anvin via Syslinux <syslinux at zytor.com>:
> On 06/18/18 13:06, R S via Syslinux wrote:
>> The narod.ru images are super outdated (FreeDOS kernel 2028) unfortunately.
>> If you are interested I could provide a 5MB FDD image template based on
>> FreeDOS 2041 kernel (the latest available at that time in 2014) where you
>> would just inject your ROM and EXE (and possibly adjust autoexec.bat to
>> autostart/apply the FW update). It's a minimal FreeDOS FDD image that
>> defaults to a clean boot with bare minimum settings (selectable in
>> config.sys) and I used this template over several years for a variety of
>> server FW updates. (FreeDOS hasn't been much updated over the years,
>> however I just found that 2042 is now available on Github.)
> It's worth noting that DOS in general doesn't necessarily handle large
> floppies well and making sure the geometry values in the FAT superblock
> matches what MEMDISK provides is essential.  An absolute maximum is
> probably 120487K (117 MiB) with a 255x15x63 geometry.
>         -hpa
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     I haven't test freedos recent years. but with ms-dos which comes
with win98, the maximum size is 256MB. I had tried to test that
several years ago. we use 256MB floppy with memdisk for our daily bios
update work.


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