PC-98: Ys II and Sorcerian only detect 1 floppy drive instead of 2 drives

[yksoft1]

Describe the bug On Neko Project II, both Ys II and Sorcerian can use 2 floppy drives. However on DOSBox-X, only one drive is detected running these games.

To Reproduce Steps to reproduce the behavior: for Ys II:

1. boot Ys II to the main game screen.
2. Press F1 to show the "ディスクロード" (Disk Load) screen.

for Sorcerian:

1. boot the Program disk.
2. Navigate the menu to "つづきをする [ロード]" (Continue game (Load)).
3. Press Enter.

Expected behavior On Neko Project II, both games tell you to insert User Disk in Drive-2.

Screenshots On DOSBox-X, the games then tell you to switch to User Disk into Drive-1.

Environment (please complete the following information):

• DOSBox-X (after Ys II fix commit)

[joncampbell123]

How are you mounting the disk images in DOSBox-X?

Are you using imgmount and boot or using boot with multiple disk images?

[yksoft1]

How are you mounting the disk images in DOSBox-X?

Are you using imgmount and boot or using boot with multiple disk images?

just like "imgmount 0 ys2p.d88 ys2a.d88 -fs none".

Ah. Ys 2 detected the Drive 2 if I imgmount the userdisk in slot 0.... But, Sorcerian still asks to put user disk in Drive 1 even I imgmounted that in slot 1.

[joncampbell123]

I see Ys II call INT 1Bh sense for floppy drive A and B, but then read BDA location 0x55C to check for second drive. It writes 0x91 (second drive number) to a memory location.

However when it comes time to prompt it still insists on swapping the first drive.

[yksoft1]

...I found that Ys 2 can't write to User Disk at all in DOSBox-X. The key of saving game is F4.

PC-98 INT 1Bh unknown FDC BIOS call AX=7D91 BX=0014 CX=0300 DX=01FF SI=3841 DI=3838 DS=0AD8 ES=0AD8 --END OF LOG--

[joncampbell123]

AH=xD means it's trying to format a track on the second drive.

DOSBox-X doesn't emulate formatting commands yet.

[joncampbell123]

I just added code to INT 1Bh emulation to fake success when asked to format a track, which seems to make Ys II save/load happy (F1=load F4=save).

[joncampbell123]

You can prevent Ys II from destroying it's own boot disk on save by arranging the floppies like this:

imgmount 1 user.dsk -fs none imgmount 0 program.fdd scenario.fdd -fs none boot -l a

You can make user.dsk in Linux like this:

dd if=/dev/zero of=user.dsk bs=1024 count=$((8*2*77))

[yksoft1]

You can prevent Ys II from destroying it's own boot disk on save by arranging the floppies like this:

imgmount 1 user.dsk -fs none imgmount 0 program.fdd scenario.fdd -fs none boot -l a

You can make user.dsk in Linux like this:

dd if=/dev/zero of=user.dsk bs=1024 count=$((8277))

Or use any formatted FDI or HDM disk image..