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Intel Advanced/ATX (Thor) COM and LPT port issues  #6428

Description

@WNT50

Checklist

  • I have searched the issue tracker and was unable to find an open or closed issue matching what I'm seeing.
  • I have verified that the issue is happening in the latest nightly build, or the latest commit, if building from source.

What happened?

Intel Advanced/ATX (Thor) always disables COM2 and initializes LPT in port 3BC, even if I manually choose COM and LPT addresses in BIOS. Intel Advanced/EV (Endeavor) using similar chipset do not suffer from this problem.

BIOS setting using version 1.00.03.CN0T:
Image

BIOS setting using version 1.00.06.CN0:
Image

Device Manager in Windows 95:
Image
Image

Configuration file

[S3 Trio64V+ PCI On-Board (Phoenix)]
memory = 2
colorkey = 1

[PS/2 Keyboard]
keys = 2

[PS/2 Mouse]
buttons = 2

[Realtek RTL8029AS #1]
bios = 0
mac = ba:82:7f

[General]
force_43 = 1
host_cpu = AMD Ryzen 7 5800H with Radeon Graphics         
uuid = da7a29aa-445c-5ed0-85a3-e7136b8c85d3
vid_renderer = qt_software

[Machine]
cpu_family = pentium_p54c
cpu_multi = 1.5
cpu_speed = 90000000
cpu_use_dynarec = 1
fpu_type = internal
machine = thor
mem_size = 131072

[Video]
gfxcard = internal
show_second_monitors = 0

[Input devices]
keyboard_type = keyboard_ps2
mouse_type = ps2

[Sound]
sndcard = internal

[Network]
net_01_card = ne2kpci
net_01_host_device = \Device\NPF_{47F9363D-0F78-40E7-988D-7C6F9157D940}
net_01_link = 0
net_01_net_type = pcap
net_01_promisc = 0
net_01_switch_group = 0
net_02_link = 0
net_03_link = 0
net_04_link = 0

[Ports (COM & LPT)]
lpt1_device = dot_matrix

[Floppy and CD-ROM drives]
cdrom_01_ide_channel = 1:0
cdrom_01_image_path = shaders/Microsoft Windows 95B (4.00.1111) (OSR2) [English]/windows95b.iso
cdrom_01_parameters = 1, atapi
cdrom_01_speed = 72
fdd_01_audio = Mitsumi
fdd_01_turbo = 1
fdd_01_type = 35_2hd_3mode
fdd_02_type = none

[Keybinds]
release_mouse = Ctrl+F12
send_ctrl_alt_del = Ctrl+Del

[Hard disks]
hdd_01_fn = sdisk/256-3.vhd
hdd_01_ide_channel = 0:0
hdd_01_parameters = 63, 16, 520, 0, ide
hdd_01_speed = ramdisk
hdd_01_vhd_blocksize = 4096
hdd_01_vhd_parent = F:/86BoxManager/ZZ/95ENG2/sdisk/256-2.vhd

[Intel Advanced/ATX (Thor)]
bios = thor

Operating system

Windows 11 25H2

86Box version

v6.0 build 8014

Build architecture

Windows - x64 (64-bit)

Build type

  • New recompiler
  • Debug build

Additional context

nvr+cfg.zip

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