VMware Player 17.5 vlance crash test

; SPDX-License-Identifier: WTFPL
; nasm test.asm -o test.img

lance_base	equ	2000h

	section	.text
	use16

	jmp short start
	nop

	; disk description table (to emulate floppy)
	db "TESTCODE"		; OEMLabel
	dw 512			; BytesPerSector
	db 1			; SectorsPerCluster
	dw 1			; ReservedForBoot
	db 2			; NumberOfFats
	dw 224			; RootDirEntries
	dw 2880			; LogicalSectors
	db 0f0h			; MediumByte
	dw 9			; SectorsPerFat
	dw 18			; SectorsPerTrack
	dw 2			; Sides
	dd 0			; HiddenSectors
	dd 0			; LargeSectors
	dw 0			; DriveNo
	db 41			; Signature
	dd 0			; VolumeID
	db "TESTCODE000"	; VolumeLabel
	db "FAT12   "		; FileSystem

start:
	cli

	; WIO/DWIO mode is unknown, try both reset

	mov	dx, (lance_base + 14h)
	in	ax, dx		; reset (16bit)

	mov	dx, (lance_base + 18h)
	in	eax, dx		; reset (32bit)

	mov	dx, (lance_base + 10h)
	xor	eax, eax
	out	dx, eax		; select CSR0, enter DWIO mode

	mov	dx, (lance_base + 14h)
	mov	eax, 14h
	out	dx, eax		; select BCR20

	mov	dx, (lance_base + 1ch)
	in	eax, dx

	; already in DWIO mode

	mov	dx, (lance_base + 18h)
	in	eax, dx		; reset (32bit)

	mov	dx, (lance_base + 10h)
	xor	eax, eax
	out	dx, eax		; select CSR0

	mov	dx, (lance_base + 14h)
	mov	eax, 14h
	out	dx, eax		; select BCR20

	mov	dx, (lance_base + 1ch)
	in	eax, dx		; *** CRASH HERE ***

stop:
	jmp short stop

	; end of boot sector and blank contents
	times 510 - ($ - $$) db 0
	dw 0aa55h

	times (2879 * 512) db 0xe5