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Archive for the ‘hacks’ Category

Emulating a hardware ROM in real time with an STM32F4

Thursday, June 14th, 2018

  ROM emulation using an STM32F4: I remember reading dhole’s  Emulating a GameBoy Cartridge with an STM32F4 some time ago thinking that it had a lot of applications with respect to old computers. In that article  a STM32F4 microcontroller  ‘pretends to be a ROM chip for a gameboy’. At the...

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Raspberry Pi virtual floppy for ISA (PC XT/AT) computers

Monday, May 7th, 2018

Dr. Scott M. Baker wrote an article detailing how he turned a Raspberry Pi into a virtual storage device for ISA bus computers: I’m tired of carrying compact flash cards and/or floppies back and forth to my XT computer. I like to do development at my desk using my modern...

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Desoldering station

Thursday, May 3rd, 2018

Stynus writes: Some time ago I bought a lot of Weller soldering irons at an auction for cheap. Between these where a few DSX 80 de-soldering irons. I also had an old Weller IG101 solder station (bought earlyer from another hobbyist), unfortunately I had no iron for this one and the...

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AtPack: Atmel Pack parser, visualizer and fuse calculator

Tuesday, April 17th, 2018

  AtPack - Atmel Pack parser, visualizer and fuse calculator from Vagrearg: Looking for an up-to-date fuse-calculator for the Atmel(*) AVR chips has been something of a long search. There are several online versions, but they have not been updated to the new chips (like the ATmega328PB). When you have got...

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Converting a Seeburg 3WA wallbox into a remote for a modern music player

Friday, April 6th, 2018

Dr. Scott M. Baker wrote an article detailing how he converted a Seeburg 3WA wallbox into a media player for his homebuilt audio player: A bit of background. These Wallboxes were used as remotes in diners and other locations back in the 1950s. You put your nickel, dime, or quarter...

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Philips Hue – control anything hack

Saturday, February 24th, 2018

Fred writes: To be honest, my recent simple relay hack wasn’t really all that great. It just used the high power constant current output to drive a SSR. It wasn’t ideal, but it worked. I decided that it was worth the effort to track down some more useful outputs and...

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PS2-TTLserial adapter for RC2014 and MIDI

Monday, October 30th, 2017

Dr. Scott M. Baker published a new build: The original reason for this project is that I wanted to build a standalone RC2014 with keyboard and display. There is an official RC2014 serial keyboard, but I find it a little inconvenient for my big fingers and poor eyesight. I have...

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Feather M0 express supersizing

Friday, October 20th, 2017

Dastels writes, "In my last post I described how I hacked a 2Mbyte SPI flash onto a Trinket M0 to give it the memory space for CircutiPython of one of the M0 Express boards. This time I supersized an M0 Express board, specifically a Feather M0 Express, although the same hack...

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Vintage MIDI: Roland MT-32, Roland SC-55, HardMPU, and an Xi 8088

Wednesday, October 11th, 2017

https://www.youtube.com/watch?v=UUNkQINpSKw Dr. Scott Baker writes: In this video, I decided to upgrade my home built PC from AdLib sound to MIDI. I tried out a couple different midi modules, the Roland MT-32 and the Roland SC-55. I learned that I'd need an MPU-401 or compatible ISA interface, and I explored...

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Modifying a computer ATX power supply for higher output voltage

Monday, October 9th, 2017

Kerry Wong wrote a post on his blog showing how he modified the 12V rail of a TL494 based ATX power supply to 14.6V for 4S LiFePO4 battery charging: To charge the 110Ah battery bank I built, I need a power supply that can provide at least 10A at 14.6V....

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Multiface 128 recreation project

Thursday, October 5th, 2017

Steve Smith  has been working on a Multiface 128 recreation project: On to the Multiface 128 recreation project. I have been attempting to find a source for an AT&Y SPEC-MATE which is a lesser known snapshot interface for the earlier Sinclair Spectrums. I used to use one back in the...

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TS100 oscilloscope hack

Thursday, September 28th, 2017

Befinitiv wrote an article describing his modification to turn a TS100 soldering iron into an oscilloscope: As you can see in the video, you can use the soldering tip as your measurement probe. Coincidentally, a soldering iron has already a pretty good form factor for an oscilloscope. Here is a still...

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Halogen floodlight SMT reflow

Tuesday, July 11th, 2017

David Sanz Kirbis built his own reflow device with an halogen floodlight, that is available on Github: First test was to check the speed of the temperature rise inside a standard halogen floodlight. Reflow soldering temperature curves are quite demanding, and some adapted ovens can't reach the degrees-per-second speed of the...

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Pulsecounting and deepsleep based IoT water meter

Monday, May 15th, 2017

Tisham Dhar has written an article detailing his pulsecounting and deepsleep based IoT water meter project: I admit to being a tiny bit obsessed with monitoring utility bills and gathering data on my usage patterns blow-by-blow. The energy monitoring has reduced my electricity bills, so I wanted to have a...

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Analog Discovery USB isolation

Monday, March 13th, 2017

  Bob writes: Back when I was deverloping the PSU burner, I wanted to have the Analog Discovery isolated from the common ground, to avoid noise and other issues. Since I did not have a way to do this, I ended up using a laptop on battery for measurements. But...

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Hacking the DPS5005

Friday, March 10th, 2017

Johan Kanflo's OpenDPS project, a free firmware replacement for the DPS5005: This write up of the OpenDPS project is divided into three parts. Part one (this one) covers reverse engineering the stock firmware and could be of interest for those looking at reverse engineering STM32 devices in general. Part two...

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An A/B battery replacement for the Zenith TransOceanic H-500 radio with filament regulation

Thursday, January 26th, 2017

KA7OEI built a battery pack to replace the obsolete "A/B" battery for Zenith TransOceanic (ZTO) H-500 and wrote a post on his blog detailing its assembly: There are several things that I decided that this voltage converter should do: Automatically power up and shut down when the radio is turned...

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Qume 842 8″ floppy drive with a RC2014 Z80 retrocomputer

Saturday, January 7th, 2017

[embed]http://www.youtube.com/watch?v=mZWWnvjGZTk[/embed] Dr. Scott Baker writes, "In this video, I try out some Qume 8 inch floppy drives that I bought on eBay. I interface them to a WD37C65 controller on my Z80 CP/M computer and I format the disks and read/write some files to them." More details at Dr. Scott M. Baker's...

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LiPo batteries hacking and refurbishing

Friday, January 6th, 2017

Karman wrote an article showing how to refurbish dead batteries to extend its life: One of the difficult parts when prototyping is to find reliable power sources. Today is still hard to find the battery size we want to use because country exporting frontiers stops these chemical packages. Here I’ll show...

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A simple push-pull audio amplifier using russian rod tubes and power transformers

Tuesday, January 3rd, 2017

KA7OEI blogged about a simple push-pull audio amplifier using russian rod tubes and power transformers: Many years ago I'd read about the type of tube that is now often referred to as a "Gammatron" - a "gridless" amplifier tube of the 1920s, so-designed to get around patents that included what would...

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