---
layout: post
title: "86Box v4.0.1"
description: "Release for October 2023."
authors: ["richardg867"]
image: "/assets/images/v4.0.1/hero.png"
---

{% include imageheading.html url="/assets/images/v4.0.1/hero.png" separator=" " %}

This is the October 2023 update to 86Box, bringing bugfixes over [the original v4.0 release](/2023/08/26/86box-v4-0.html), as well as a few new features.

The work-in-progress build currently available to our [**Patreon supporters**](https://www.patreon.com/86box) will be receiving a v4.0.1 update as well. This WIP build contains a new **Local Switch** feature for connecting 86Box machines locally or across a network in a plug-and-play, cross-platform way, without relying on PCap or VDE.

<hr />

## Important notes

### ROM set update

Despite this being a minor bugfix release, the **ROM set was also updated** to reorganize the growing collection of **Plug and Play Sound Blaster** cards and fix an issue with the **MSI MS-5119** machine. Remember to update the ROM set when updating 86Box, otherwise emulated machines using any of the aforementioned hardware **will have it removed**.

### MSI MS-5119 BIOS update

After updating the ROM set, the MS-5119 BIOS update to fix PS/2 mouse issues is **not applied automatically to existing emulated machines** using that board. Apply it by deleting `ms5119.bin` from the machine's `nvr` directory, then start the machine and check if the BIOS version displayed below the American Megatrends logo is `A37EB` instead of the previous `A37E`.

### Tertiary and quaternary IDE

Due to a longstanding oversight, previous versions of 86Box had the tertiary and quaternary IDE controllers **switch places**, using the incorrect I/O port and IRQ resources for their respective channels. This swap has now been fixed; additionally, the tertiary channel provided by **Plug and Play Sound Blaster cards** is now a quaternary channel. If you use these additional IDE channels, make sure any drives connected to them are placed correctly after updating.

<hr />

## Changelog

### Emulator

* Added **Auto-pause on focus loss** option
* Added **4:3 integer scale** option for full screen mode
* Added `-X/--clear cmos|flash|both` command line option to reset the machine's CMOS data and/or BIOS flash
* Added `-M/--dumpmissing` command line option to output a list all machines and video cards for which ROMs are missing
* Added `-Y/--donothing` command line option to output the initial log information then exit
* Fixed **Discord integration** option remaining active if integration is not supported on the host platform
* Changed minimum supported configuration file version (machines last used on 86Box versions **older than v3.0 final** must be loaded on v4.0 or v3.11 first to convert their configuration files)

### User interface

* Moved **on-board device settings** from the machine's Configure button to the devices' respective Configure buttons
* Fixed **on-board sound and network** incorrectly selectable as secondary devices
* Fixed **Softfloat FPU** incorrectly available on machines with no FPU
* Updated translations: **Chinese (Simplified)**, **Chinese (Taiwan)**, **Japanese**

### Machines

* Added **Intel CU430HX** Socket 7 motherboard (retail version of the **Toshiba Equium 5200D**)
* Added on-board Sound Blaster ViBRA 16 sound to the **Intel Advanced/EV** and **Toshiba Equium 5200D**
* Fixed **MSI MS-5119** PS/2 mouse issues by updating the BIOS
* Fixed **NCR PC4i** memory amount selection glitches
* Fixed boot issues with PCI cards on the **PC Chips M579** and **M729**
* Fixed **Microsoft Virtual PC 2007** crashing the emulator on startup
* Fixed **Compaq Portable series** gas plasma display glitches
* Fixed non-functional minimum memory amounts on the **Soyo 4SAW2** and **Zida Tomato 4DP**
* Fixed inaccurate BIOS CPU frequency read-outs on several **Intel motherboards**
* Fixed incorrect Planar ID on the **IBM PS/2 Model 60** (again)
* Changed **IBM PS/2 Model 70 Type 4** to require CPUs with a built-in FPU
* Changed **Quadtel 286 clone** to require Softfloat FPU

### Hardware

* **Core**
  * Fixed constant host disk writes caused by applications which actively use the **real time clock**
  * Fixed **INS and OUTS** instruction behavior on the NEC V20 and V30
* **Display**
  * Fixed **ATI Mach32** conflicting with **Voodoo cards**
  * Fixed graphics corruption upon switching from interlaced graphics to text mode on **Cirrus Logic** and **Paradise** cards
  * Fixed graphics corruption with **Paradise** and **Trident TGUI** cards on specific video modes
  * Fixed **IBM XGA** not detected by the XGAKIT tool
  * Fixed more specific graphics corruption issues on the **IBM 8514/A** and **XGA**
  * Changed **Image Manager 1024** to the 8-bit ISA bus (requires a V20 or V30 CPU)
* **Sound**
  * Added **Sound Blaster ViBRA 16C**, **16S** and **16XV** cards
  * Fixed **Gravis Ultrasound** MIDI playback issues
  * Fixed FM synthesis issues on cards with the **Yamaha OPL4**
  * Changed IDE channel on **Plug and Play Sound Blaster** cards to quaternary
  * Changed ROM locations for **Plug and Play** and **AWE32 Sound Blaster** cards
* **Network**
  * Fixed **PLIP** crashing the emulator upon sending any packets
* **Ports**
  * Fixed **serial port passthrough** setting incorrect host port parameters on Linux and macOS hosts
* **Storage**
  * Increased the **maximum CD-ROM drive count** to 8
  * Added **IBM PS/2 SCSI Adapter (Tribble)** for MCA machines
  * Fixed incorrectly switched resources on the **tertiary and quaternary IDE** controllers
  * Fixed issues with **CD audio track timing** on specific cue/bin images
  * Fixed **Adaptec AHA-154xB** incorrectly working with later incompatible versions of the DOS driver