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Installing OS/2 Warp 3 in pc9821ap2

Notes at the time of writing:
- Bleeding edge or upcoming MAME 0.272.
- Doesn't work in plain pc9821 (kernel panic during install), do not bother in anything beyond pc9821ce2 (will make use of PCI features, assuming you even get there)

1. Enable IDE BIOS in Machine Configuration thru TAB menu (step eventually to be removed)

2. Create a chdman HDD,
3. Startup the machine

4. You will be greeted with an █ █ OS/2 prompt then this, which just means to swap os/2 warp 3 with Disk 1 in Drive A then strike enter key


5. Loading from floppy drive, with an extra more laconical "loading" screen afterwards


6. Once done, OS/2 will ask to insert installation floppy again, and CD-Rom if it isn't already


7. Ask for user to select between Basic or Advanced configuration. The HDD partition is currently unformatted so need to choose Advanced here


8. Select 1 for formatting the HDD with one contiguous partition.


9. Partitioning complete, remove and reinsert the Install Disk media (?), then at "SYSTEM SHUTDOWN" soft reset the machine


10. Now redo step 4, until you reach this, select 1 if one partition is used


11. Asks you if you want the normal PC-98 letter scheme (1, A: will be HDD) or the more canonical DOS/V schema (where A: is floppy and C: is HDD)


12. install phase 1


13. At the end of it, will ask for removing floppy drive then strike enter -> "SYSTEM SHUTDOWN" -> soft reset


At this point once rebooted OS/2 will ask for the usual device select and what OS parts to install, at the time of this writing those screens are broken so delaying this (trivial) part for later.