blog:pc98_hdd

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blog:pc98_hdd [2019/08/04 09:47] – johnblog:pc98_hdd [2020/03/28 12:11] (current) – john
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 PC-98 A-Mate series (Ae, Ap, An) all have a limited BIOS which supports IDE drives up to 540MB, some later machines support up to 4.3GB. SCSI controllers and disks can go bigger, up to 30GB-ish in some cases. PC-98 A-Mate series (Ae, Ap, An) all have a limited BIOS which supports IDE drives up to 540MB, some later machines support up to 4.3GB. SCSI controllers and disks can go bigger, up to 30GB-ish in some cases.
  
-However, support for anything bigger is just not possible on the stock system, such as [[https://targetearth.dyndns.org/vgdb/system/86|my PC-9821AN]]. Fortunately someone has developed a custom ROM overlay that replaces the standard BIOS routines that interface with the IDE drive to support up to 120GB (the limit of LBA28 or CHS addressing).+However, support for anything bigger is just not possible on the stock system, such as [[https://www.target-earth.net/vgdb/system/86|my PC-9821AN]]. Fortunately someone has developed a custom ROM overlay that replaces the standard BIOS routines that interface with the IDE drive to support up to 120GB (the limit of LBA28 or CHS addressing).
  
 It is technically possible to write this ROM to an unused card on the PC-98 C-Bus and have it initialised at boot time. The most common method would be something like a SCSI card, where the SCSI functions are not needed. It is technically possible to write this ROM to an unused card on the PC-98 C-Bus and have it initialised at boot time. The most common method would be something like a SCSI card, where the SCSI functions are not needed.
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 That's saying something about not being able to write the boot sector or something along those lines... it's the same regardless of disk. Also notice that it picks up the incorrect size of the partition, in the above image it should be showing a entire-drive partition from a 60GB disk... but it doesn't. That's saying something about not being able to write the boot sector or something along those lines... it's the same regardless of disk. Also notice that it picks up the incorrect size of the partition, in the above image it should be showing a entire-drive partition from a 60GB disk... but it doesn't.
  
-What you actually need to use is a tool called FORMATX which cannot be found on the web any more but can still be found via archive.org, at the links below or, alternatively, download a local copy from here: [[https://targetearth.dyndns.org/static/VGDB-images/pc98/fmtx128.lzh|fmtx128.lzh]]+What you actually need to use is a tool called FORMATX which cannot be found on the web any more but can still be found via archive.org, at the links below or, alternatively, download a local copy from here: [[https://www.target-earth.net/static/VGDB-images/pc98/fmtx128.lzh|fmtx128.lzh]]
  
 [[https://web.archive.org/web/20150303004824/http://hp.vector.co.jp/authors/VA012947/soft_disk.html|Archive.org copy of the HD disk software page]] - with links to other tools (for reference, the current page is [[http://hp.vector.co.jp/authors/VA012947/soft_disk.html|here]] and has no reference to FORMATX any more). [[https://web.archive.org/web/20150303004824/http://hp.vector.co.jp/authors/VA012947/soft_disk.html|Archive.org copy of the HD disk software page]] - with links to other tools (for reference, the current page is [[http://hp.vector.co.jp/authors/VA012947/soft_disk.html|here]] and has no reference to FORMATX any more).
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 === IBM/PC Compatible Partitions === === IBM/PC Compatible Partitions ===
  
-The PC-98 partition table is now compatible with Windows/Linux, even though the filesystems contained in those partitions are. Once you've fully formatted the disk using FORMATX in PC-98 DOS, you then run a utility named CONV98AT.EXE to make a PC-compatible partition table: http://hp.vector.co.jp/authors/VA012947/hduty/conv98at.html+The PC-98 partition table is //not// compatible with Windows/Linux by default, even though the filesystems contained in those partitions //is//. However, once you've fully formatted the disk using FORMATX in PC-98 DOS, you then run a utility named CONV98AT.EXE to make a PC-compatible partition table: http://hp.vector.co.jp/authors/VA012947/hduty/conv98at.html
  
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  • by john