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EGA/VGA card bug #4001

Description

@gamegod333

What happened?

I have a demo program that runs perfectly on PCem, but there are some display issues on 86box. Both simulate the same CPU, same motherboard, same graphics card, and also have issues with some other EGA/VGA cards in the 86box.

Configuration file

[General]
vid_renderer = qt_software
confirm_save = 0
confirm_exit = 0
language = zh-CN
confirm_reset = 0
video_fullscreen_first = 0
force_43 = 1
window_remember = 1

[Machine]
machine = p55t2p4
cpu_family = pentium_p54c
cpu_speed = 133333333
cpu_multi = 2
cpu_use_dynarec = 1
fpu_softfloat = 0
time_sync = local
fpu_type = internal
cpu = 6
mem_size = 8192

[Video]
gfxcard = stealth64d_pci
show_second_monitors = 0

[Input devices]
mouse_type = ps2

[Sound]
fm_driver = nuked
sndcard = sbawe32
midi_device = cm32l

[Network]
net_01_link = 0
net_02_link = 0
net_03_link = 0
net_04_link = 0

[Storage controllers]
hdc = none
cassette_mode = load

[Hard disks]
hdd_01_parameters = 63, 16, 4158, 0, ide
hdd_01_fn = PCDOS.vhd
hdd_01_speed = ramdisk
hdd_01_vhd_blocksize = 4096
hdd_01_ide_channel = 0:0

[Floppy and CD-ROM drives]
fdd_01_turbo = 1
fdd_02_type = 35_2hd
fdd_02_turbo = 1
cdrom_01_speed = 72
cdrom_01_parameters = 1, atapi
cdrom_01_ide_channel = 0:1
fdd_01_type = 35_2hd
cdrom_01_type = 86BOX_CD-ROM_1.00

[System MIDI]
midi = 1

[DTK PII-147 Hexa I/O Plus]
base = 0240

[Monitor #1]
window_coordinates = 122, 255, 720, 540

[Monitor #2]
window_coordinates = 0, 0, 0, 0

[Roland CM-32L Emulation]
output_gain = 50
reverb = 1
reverb_output_gain = 50
reversed_stereo = 0
nice_ramp = 1

[Ports (COM & LPT)]
lpt1_device = dot_matrix

Operating system

Windows 11

CPU

i7 10700K

86Box version

v 4.0.1 [build 5111]

Build architecture

Windows - x64 (64-bit)

Build type

  • New recompiler
  • Debug build

Download source

Official website (Jenkins, GitHub)

Additional context

My DEMO file: CE.COM,"ce/?" to display help.
CE.zip

86Box vs PCem Execute video:
https://github.com/86Box/86Box/assets/93089941/a3bef8d1-cb00-4ad6-a35b-991f694b4c1f

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