Emulator
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Windows:
https://simk98.github.io/np21w/download.html
http://nenecchi.kirara.st/#PC-98

Unix:
https://github.com/AZO234/NP2kai
http://www.nonakap.org/np2/


Other Collections
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https://tss.asenheim.org/ - browser based, no emulator required 

https://archive.org/download/NeoKobe-NecPc-98012017-11-17
https://www.myabandonware.com/browse/platform/pc98/
https://refuge.tokyo/pc9801/en/Adventure_ABCD.html


Instructions
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PC-98 Emulation For Beginners
https://gang-fight.com/projects/98faq/

Intro to NEC PC-9800 World
https://web.archive.org/web/20160510143033/http://euc.jp/articles/pc9800.en.html

NEC PC-9800 Quick Guide
http://newsonya.narod.ru/pc9821/quick-guide/quick-guide-intro.html

How to create a bootable hard disk image (hdi)
http://fullmotionvideo.free.fr/pc98/articles/hdi/hdi.html

第3回 N88-BASICで学ぶプログラミング入門
http://worholicanada.mydns.jp/pc98/00303.html

Creating PC-98 Music: A Beginner's Guide 
https://creation.fandom.com/wiki/Creating_PC-98_Music:_A_Beginner%27s_Guide


Forums
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http://www.shrinemaiden.org/forum/index.php/topic,11117.msg736742.html#msg736742
https://www.vogons.org/viewtopic.php?f=9&t=47469
https://nfggames.com/forum2/index.php?topic=5369.0
https://web.archive.org/web/20141104161252/http://www.assemblergames.com/forums/showthread.php?37914-PC-9821-PC-9801-Primer


Tools and Resources
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Disc Editor 
https://hp.vector.co.jp/authors/VA013937/editdisk/index_e.html

Sprites
https://www.spriters-resource.com/nec_pc_9801/

Patching
https://46okumen.com/pachy98/

Graphics systems of NEC PC-98
https://web.archive.org/web/20180630204922/http://island.geocities.jp:80/cklouch/column/pc98bas/pc98disphw_en.htm

Turbo C Instructions 
http://seclan.dll.jp/dtdiary/1999/dt19990924.htm


Books
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https://archive.org/details/opensource?sort=titleSorter&and[]=mediatype%3A%22texts%22&and[]=languageSorter%3A%22Japanese%22&and[]=firstTitle:P&and[]=subject%3A%22PC-9801%22

PC-9801 Programmer's Bible 
https://archive.org/details/PC9801Bible


Unix 
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http://ftp-archive.freebsd.org/pub/FreeBSD-Archive/old-releases/pc98/
https://www.nisoc.or.jp/~karl/
http://jijijiji.com/computer/index.html
http://www.jp.freebsd.org/pc98/
http://mai.privatelink.org/old/98dos.html
http://www2j.biglobe.ne.jp/~Lazy/netbsd/p1_inst.htm
http://netbsd98current.osdn.jp/
http://www.ebug.jp/pub/docs/20030419/pc98.pdf
https://web.archive.org/web/20150603193719/http://www32.ocn.ne.jp/~chi/FreeBSD/


Libraries
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https://www.pc98.org/main.html
https://pc98library.tistory.com/
https://vsrecommendedgames.fandom.com/wiki/PC-98
https://retro-type.com/PC98/
http://gyusyabu.ddo.jp/