Bec got me an IBM 5150 PC for Christmas! In this video, I swap out the MDA video adapter for a VGA adapter and test it out.

Here’s some details discussed/discovered in the video:

Video Card

Since I don’t have an MDA monitor, I install an 8-bit Western Digital PVGA1A-JK based video card. (Thanks to user KD5VMF for his/her knowledge of the video card dip switches posted here on the Vintage Computer Forum: http://www.vcfed.org/forum/archive/in…) Also of note and not shown in the video is that I had to set SW1 switches 5 and 6 to “On” in order for the VGA card to work.

CPU

I also discover the computer has an NEC D8088D CPU installed instead of the stock Intel CPU. This is odd because the two are functionally identical. The original CPU may have went bad but I guess we’ll never know.

IBM DOS and the 5.25″ Floppy Drives

I boot the machine with IBM DOS 3.21 and IBM DOS 3.3. The IBM-branded “A:” drive works. The “B:” drive does not. An attempted repair video will be forthcoming.

Just in case anyone needs it, here is a driver floppy disk image for the Network Anywhere 10/100 PCI Ethernet Adapter. The original floppy I made this from came with a card I bought on a sweltering July night in 2003 at my local Wal-Mart to satisfy some crazed nerd project I was working on.

You will need 7-Zip to extract the image and something like WinImage to write it to disk.

There’s a scary threat sweeping the computing world known as ransomware. Ransomware is a type of harmful software that makes your data unreadable unless you pay the creator money to make it readable again. And, unlike the threats of yesteryear (i.e. viruses, Trojans, rootkits, etc.), it is extremely unlikely that any antivirus software can help you recover your data because it is encrypted in such a way that even a supercomputer can’t easily descramble it. Even worse, most users don’t do anything wrong to get infected. Clever hackers have figured out how to infect machines by infecting perfectly reputable websites with malware that installs the ransomware just from visiting.

When users are infected with ransomware, they are normally greeted with a sort of virtual ransom note  that explains how much it will cost to get their data back, how long they have to pay up, and where to send the money. If you don’t pay, the bad guys delete the key and your data is lost forever because the key is nearly impossible to guess. If you’re wondering why law enforcement can’t just trace the accounts where the ransom money gets deposited, it’s because payment must be made in Bitcoin, which is an odd currency born on the Internet that gets traded and exchanged for actual monies on some of the darkest corners of the Internet. This ensures there is no paper trail to follow. Most ransomware makers will decrypt your files if you pay as instructed, but there’s absolutely no guarantee your infector will follow through.

The only thing you can do to protect yourself is back up your important files often onto something that can’t be changed by ransomware if it finds its way onto your computer. Flash drives are great because you can make the backup and disconnect it from the machine. Even better is the old-school method of burning your important files to a CD or DVD because the ransomware can’t change the data because optical discs are read-only once burned. Hopefully, the antivirus makers will figure out how to neutralize ransomware, but for now, backup often or literally pay for it later.

Let’s say you forget your LimeSurvey admin password and, very importantly, the server it’s running on cannot send email. Since the normal method for resetting a forgotten password involves email you will need to update the password via the underlying MySQL database.The password is stored as a SHA256 hash, so you need to use the MySQL function SH2() to complete the update. The actual query looks like this:

UPDATE `tblpr_users`
SET PASSWORD = sha2('newPassword*',256)
WHERE uid = 1


Keep in mind that the table name (in this case tblpr_users) should be adjusted to whatever your table prefix is. Also, the password string (the first parameter in the SHA2 function) needs to be changed to whatever your password is.

The short answer that fixed the electrical noise problem: Plug a powered USB hub into a USB port on your machine. Then plug the Audiobox USB into that. From what I can tell, if your USB port isn’t putting out enough power, you will get hissing and/or electrical wave noise. (I used a cheap, powered USB power squid hub I’ve had forever.)

The long answer with details: Back in April, I bought a PreSonus AudioBox USB 2×2 audio interface so I could use a Shure SM-58 microphone to record instructional videos. I’ve tried many other mics, including a Blue Yeti USB, and while several sounded good, I could never get the level of noise rejection that I wanted. My mouse and keyboard clicks were always too loud and I have a noisy heat pump. No matter what I did with gain, levels, and pop filters, there was always too much unwanted background noise. The SM-58 has excellent noise rejection and had a nice rich sound for spoken-word content like I would be producing.

I got the unit home and setup the latest driver from PreSonus prior to plugging the unit in as instructed. I plugged up the unit and it installed fine. I opened Audacity and recorded several test tracks to get my levels set properly. The problem was when I set my levels in the butter zone between too quiet and clipping, there was always some form of electrical noise. Sometimes, it was a hiss, sometimes it was a sine wave pattern, sometimes it was a “click click click.” It was totally unacceptable. Here’s all the stuff I tried that DID NOT work:

1. I unplugged and plugged back in the unit in the same USB port.
2. I unplugged and plugged back in different USB ports, including ones integrated on my motherboard and others on a Silverstone PCI-E USB 3.0 card hooked to the machine. No difference.
3. I rebooted many times in different configurations.
4. I made sure all peripherals plugged into my machine were on the same AC circuit (to make sure it wasn’t a ground-loop problem).
5. I bought a new gold-plated, shielded USB cable from Monoprice. This helped actually helped a little, but not enough.
6. I rerouted every cable going into my machine such that the Audiobox USB cable had no other cables within 6″ of it. Additionally, I made sure the monitor headphones and mic cables were straight and not crossing one another in any way.

I was fed up and tempted to order a more expensive unit from a different company. In a last ditch effort, I plugged in a cheap USB powered power squid hub into one of the integrated USB ports on my motherboard, then plugged the Audiobox One into that. To my sheer amazement and delight, that worked like a charm! Even with the gain all the way up on my mic channel, no noise whatsoever. And playback through the unit into the monitor headphones is crisp and clear. None of the aforementioned electrical noise! My only guess is that the unit doesn’t do well if there isn’t enough power coming from the USB port. Instead of not working at all, it makes due and produces a terrible signal.

I didn’t try a powered USB hub sooner because back in the day, the conventional wisdom was that any USB audio gear should be plugged directly into the motherboard. It’s 2015, so I guess that isn’t always the case anymore. For what it’s worth, I’m not going to plug anything else into the powered hub for fear that it may mess up the sweet perfection of my current audio signal!