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Lenovo ThinkCentre M720s Desktop (Humbopeep)

Humbopeep Front
ArcaOS license type


This new Lenovo ThinkCentre M720s computer is compatible with ArcaOS. It features a Pentium Gold G5400 processor, 4 GB RAM, 500 GB hard drive and a DVD-Writer. The Intel UHD Graphics 630 on the motherboard produces the fastest graphics I have yet measured on an OS/2 machine.


After you add the computer and optional CPU upgrade to the cart, proceed to the Accessories page to add PS/2 ports, parallel port, floppy drive, hard drive upgrade, IDE card or a USB 2.0 card.


CPU upgrade

The central processing unit (CPU) can be upgraded to the Intel Core i7 for faster processing and graphics.

CPU upgrade

Quebopeep CPU upgrade

CPU upgrade: $200.00 USD

PS/2 Ports

This computer has optional PS/2 ports, used for old keyboards. This one is tested with the 122-key keyboard used by 3270 and 5250 emulators.

PS/2 Ports

Humbopeep PS/2 Ports

PS/2 Ports: $75.00 USD

Parallel Port

This computer has an optional parallel port.

Parallel Port

Parallel Port

Parallel Port: $50.00 USD

IDE Card

This PCIe-X1 bus card provides an internal IDE connection. You can use this card with DaniS506.ADD to provide support for Parallel ATA (PATA) hard drives.

IDE Card

IDE Card

PCIe IDE Card: $75.00 USD

USB Floppy Drive

This external USB Floppy drive can be used to read and write 720K and 1.44M 3 1/2 inch floppy disks.

USB Floppy Drive

USB Floppy Drive

USB Floppy Drive: $50.00 USD

External WiFi

Using a travel router with a desktop can free you from a wired Ethernet connection. I use the Mango Travel Router to access local WiFi or my phone's hot spot. Mango comes with everything you need to connect to an access point.

Mango Travel Router

Mango Thumbnail

Mango Travel Router: $65.00 USD

In the past, I have also used a TP-Link AC750 Wireless Travel Router, an Asus RP-N12 Wireless N300 Range Extender, and a TP-Link Nano Router. I include a folder of URL links to the admin pages of each of these routers to make it easy to set up the first time.

Instructions and details about external WiFi: Travel Routers

Hard drive upgrade

The hard drive can be upgraded to a 2 TB drive. Either a hard disk or an SSD is available to upgrade.

Hard drive upgrade

Quebopeep hard drive upgrade
Storage type

Custom Orders

If you want to buy a customized version of this computer, fill out an order form and submit it to Blonde Guy. Blonde Guy will review your order and send you an invoice, payable using PayPal or any major credit card. If you prefer to pay by check, note that in the notes field of the order form, and I will e-mail you an invoice payable by check.

Enter the customizations you want on the computer in the notes portion of the order form.


Manufacturer: Lenovo
Model: ThinkCentre M720s Desktop
Model number: 10SUS0JB00
alternate Model number: 10STCTO1WW
Year introduced: 2019
CPU: Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz
alternate CPU: Intel(R) Pentium (TM) Gold G5400 CPU 3.7 GHz (2 cores)
RAM: 4.0 GB PC3-12800 1600MHz DDR3
Hard drive: 500 GB 3.5 inch SATA
Optional hard/solid state drive: 2000 GB SATA
Optical drive: LiteOn DS-8ACSH Internal DVD Drive
Network: Intel Gigabit Ethernet using MultiMac32-E1000E driver
Audio: HDA Intel PCH using Uniaud, USB Audio headphone out, microphone in
USB ports: 8 USB 3.0 ports (4 front, 4 back)
USB controllers: 1 XHCI for all built-in ports
Serial ports:1
PS/2 ports: 2 (optional)
Video ports: VGA, 2 DisplayPorts Internal slots: 2 PCIe-1, 1 PCIe-16 half height
Parallel port: 1 (optional)

Physical Dimensions

Height: 10.8 inches
Width: 3.9 inches
Depth: 11.9 inches
Weight: 9.4 lbs

Power Consumption

Power consumption is 19 Watts, measured with the computer is booted to the desktop and idle. In use, with all cores at 100% the computer can consume about 40 watts. This computer consumes 1 Watt if it's plugged in, but switched off.

Disk Layout

The disk is partitioned to provide a bootable operating system volume and a bootable installer. Space is left for addtional bootable volumes. User data is stored on a separate volume.

This is the layout for the 500 GB HD.

Volume NameDisk FormatDrive LetterVolume SizeDisk Name
ArcaOS-HJFS H:10,001 MBInternal 500 GB
Data JFS D:426,938 MBInternal 500 GB

This is the layout for a 2 TB drive.

Volume NameDisk FormatDrive LetterVolume SizeDisk Name
RecoveryFAT16 X:2,000 MB2 TB SSD
ArcaOS-FJFS F:10,001 MB2 TB SSD
Data JFS D:1,857,718 MB2 TB SSD

ArcaOS version

ArcaOS 5.0.7 (December 7, 2021) is the version used for this installation.

Performance Benchmarks

Two benchmarks are presented here. First is the more recent run on a computer with core-i5 CPU. The second is on the original computer running a Pentium-Gold CPU.

This table reports the SysBench 0.9.5 benchmarks for this computer. You can download SysBench 0.9.5 here:

Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz

PM-Graphics-marks 316
CPU integer-marks 19607
CPU floating point-marks 2890
DIVE-marks 23784
File I/O-marks 76349
Memory-marks 22332
Simultaneous I/O-marks 50
Disk I/O-marks 757

Intel(R) Pentium (TM) Gold G5400 CPU 3.7 GHz (2 cores)

PM-Graphics-marks 275
CPU integer-marks 8413
CPU floating point-marks 596
DIVE-marks 9514
File I/O-marks 93531
Memory-marks 28253
Simultaneous I/O-marks 43
Disk I/O-marks 707

With an SSD installed, these are the benchmarks for Pentium Gold CPU. SysBench does not correctly run Disk I/O-marks on SSD, so that benchmark is omitted. See File I/O-marks for comparitive information on disk performance.

PM-Graphics-marks 280
CPU integer-marks 8390
CPU floating point-marks 598
DIVE-marks 10012
File I/O-marks 203037
Memory-marks 28046
Simultaneous I/O-marks 62


Preloaded Software

Each Blonde Guy ArcaOS preloaded computer comes with a standard load of software. This page lists what is in the current pre-load. This list is updated over time to incorporate new essential OS/2 software as well as to keep up to date versions of existing software. When you receive your ArcaOS preloaded computer, you will have Blonde Guy's best installation of the latest OS/2 software.

Recovery DVD

The recovery DVD supplied is a bootable ArcaOS DVD with a backup of the hard drive as delivered. You can boot the machine from DVD, and perform maintenance functions. The maintenance folder is available on the recovery DVD. The factory backup is stored in the \Factory directory. The backups are simple zip files. You can use 7z or unzip to extract some or all of the files in a backup.

Build Notes

This section documents what I did to get this computer to work under ArcaOS. It is intended to show what goes into this computer, and also as a guide to the user who wants to build it himself.

BIOS changes

After powering up the computer, press F1 to enter the BIOS. There is no BIOS password.

The following changes to BIOS settings are needed to run ArcaOS.