Way before you kids had touch screens and mice, we had to walk uphill both ways to tell a computer where we were pointing at on the screen. I speak, of course, of light pens. When these photodiodes in a pen were pointed at a CRT, the display driver would tell the computer where the pen was pointing. It’s a pretty incredible video hack today, and these things were around in the 1970s. You could, of course, use a light pen with most of the old 8-bit home computers, including the Commodore 64.
The build is called the LightHammer. It’s a light pen, inside the head of a plastic hammer, with a few springs, nuts, and washers to tell the computer to read the light pen input. The light pen itself is just a photodiode with a few transistors; it was a simple circuit in the 80s, and it’s a simple circuit today.
A new input device isn’t worth anything without an app to show off the tech, and [Jan] is about three steps ahead of us here. He wrote a game for this LightHammer – a digital version of Whac-A-Mole and Simon. They’re exactly what you think they are: the classic ‘repeat the computer’ and ‘murder rodents’ games.
If that’s not enough, [Jan] also built an arcade cabinet for his C64 setup, with the monitor, joysticks, a 1541, and a TV mounted in a cabinet that would look great in a bar. You can check out a video of that and the games using the LightHammer below.
Remember this Android app that will tell you the value of resistors by reading their color code. Another option for the iOS crowd was presented at Maker Faire last weekend. It’s called ResistorVision, and it’s perfect for the colorblind people out there. An Android version of ResistorVision will be released sometime in the near future.
A few folks at Langly Research Center have a very cool job. They built a hybrid electric tilt wing plane with eight motors on the wing and two on the tail. It’s ultimately powered by two 8 hp diesel engines that charge Liion batteries. When it comes to hydrocarbon-powered hovering behemoths, our heart is with Goliath.
A bottom-of-the-line avionics panel for a small private plane costs about $10,000. How do you reduce the cost? Getting rid of FAA certification? Yeah. And by putting a Raspberry Pi in it. It was expoed last month at the Sun ‘N Fun in Florida, and it’s exactly what the pilots out there would expect: a flight system running on a Raspberry Pi. It was installed in a Zenith 750, a 2-seat LSA, registered as an experimental. You can put just about anything in the cabin of one of these, and the FAA is okay with it. If it’ll ever be certified is anyone’s guess.
This will come to no surprise to anyone who has ever talked to me for more than a few minutes, but one of my guilty Internet pleasures is heading over to eBay’s ‘vintage computing’ category, sorting by highest price, and grabbing a cup of coffee. It’s really just window shopping and after a while you start seeing the same things over and over again; Mac 512s with a starting bid far more than what they’re worth, a bunch of old PC-compatible laptops, and a shocking amount of old software. For the last week I’ve been watching this auction. It’s a Commodore 65 prototype – one of between 50 and 200 that still exist – that has over 60 bids, the highest for over $20,000 USD. It’s the most successful vintage computer auction in recent memory, beating out the usual high-profile auctions like Mac 128s and Altair 8800s. The most valuable home computer is the Apple I, but if you’re wondering what the second most valuable one is, here you go.
The C65 is not a contemporary of the C64, or even our own [Bil Herd]’s C128. This was the Amiga era, and the C65 was intended to be the last great 8-bit machine. From a page dedicated to the C65, it’s pretty much what you would expect: the CPU is based on a 6502, with the on-die addition of two 6526 CIA I/O controllers. The standard RAM is 128kB, expandable to 8MB by an Amiga 500-like belly port. Sound would be provided by two SIDs, and the video is based on the VIC-III, giving the C65 a pallette of up to 4096 colors and a resolution of up to 1280×400.
There’s still a little over five hours to go in the auction, but the current $21000 price should go even higher in the final hour; a C65 auction from a few years ago fetched $20100 for ‘a computer with missing parts’. This auction is for a complete, working system that has remained intact since it was discovered during the Commodore closing.
History and [Bil Herd] teaches us that Commodore begged, borrowed, or stole the engineers responsible for the Speak & Spell to add voice synthesis to a few of the computers that came after the C64. This didn’t quite work out in practice, but speech synthesis was something that was part of the Commodore scene for a long time. The Votrax Type ‘n Talk was a stand-alone speech synthesizer that plugged into the expansion port of the VIC-20. It was expensive, rare, but a few games supported it. [Jan] realized the state of speech synthesis has improved tremendously over the last 30 years, and decided to give his VIC a voice with the help of a cheap Android phone.
A few VIC-20 games, including [Scott Adams] adventure games, worked with the Votrax speech synthesizer by sending phonemes as text over the expansion port. From there, the Votrax would take care of assembling everything into something intelligible, requiring no overhead on the VIC-20. [Jan] realized since the VIC is just spitting out characters for each phoneme, he could redirect those words to a better, more modern voice synthesizer.
A small Bluetooth module was wired up to the user port on the VIC, and this module was paired with a cheap Android smartphone. The smartphone receives the serial stream from an adventure game, and speaks the descriptions of all the scenes in these classic adventure games.
It’s a unique experience judging from the video, but the same hardware and software can also be added to any program that will run on the VIC-20, C64, and C128. Video below.
[Dirk] has some great documentation to go with his computer. He started with a classic MOS 6502 processor. He surrounded the processor with a number of support chips correct for the early 80’s period. RAM is easy-to -use static RAM, while ROM is handled by UV erasable EPROM. A pair of MOS 6522 Versatile Interface Adapter (VIA) chips connect the keyboard, LCD, and any other peripherals to the CPU. Sound is of course provided by the 6581 SID chip. All this made for a heck of a lot of wires when built up on a breadboard. The only thing missing from this build is a way to store software written on the machine. [Dirk] already is looking into ways to add an SD card interface to the machine.
The home building didn’t stop there though. [Dirk] designed and etched his own printed circuit board (PCB) for his computer. DIY PCBs with surface mount components are easy these days, but things are a heck of a lot harder with older through hole components. Every through hole pin and via had to be drilled, and soldered to the top and bottom layers of the board. Not to mention the fact that both layers had to line up perfectly to avoid missing holes! To say this was a lot of work would be an understatement.
[Dirk] designed a custom 3D printed case for his computer and printed it out on his Ultimaker. To make things fit, he created his design in halves, and glued the case once printing was complete.
If awesome hardware and a case weren’t enough, [Dirk] also spent time designing software for the machine. He wrote his own abbreviated BASIC interpreter along with several BASIC programs. You can find everything over on his GitHub repository.
We always love writing up well-documented, and just generally awesome projects like [Dirk’s]. If you know of any retro computers like this one, drop us a tip!
This year’s CES has dredged up some memories. I had assumed that as one becomes old they are supposed to become used to memories of a young vigorous person that shared their body and memories leaving little else except some scars and some old stale socks lying around plus 2 or 3 pictures to prove it was in fact not a series of hallucinations. Turns out you don’t get used to it, you just endure.
30 Years ago was our CES: Commodore had the reputation of showing something new every CES and this was a time when a Home Computer meant a Consumer Computer. I have written before about how we endeavored to make sure other’s failures didn’t become ours and we did in fact make it, just in time, to the ’85 CES with what became our flagship computer, at least for the next 4 days.
To the Very Last Minute
1985 Commodore CES Booth
Commodore 1985 CES Booth: an “elegant” grey and yellow battleship parting the CES seas. (Marketings’ idea)
Putting 85 CES together. Pics courtesy of [Terry Ryan]
When I say made it just in time I am counting people hand carrying the last ten or so homebrewed and MOS cooked 80 column chips either the night before or that very morning. The C128 computers where waiting lined up and open in the room seen below; cases agape much like a row of baby birds waiting on whatever engorgement MOS had come up with for us as the seconds counted down.
And then finally we stood on the second floor of our booth (yes they built a 2 story structure for us in a couple of hours the night before) surveying the now working computers; C128’s and the never released LCD machine, when the last “issue” before the doors opened arrived; a Marketing person (panting) telling us of “yet another C128 failure” though she couldn’t actually point to any previous computers that had failed. We wouldn’t let her continue with her complaint until she retracted the previous general statement of failure, more on principle than actual meanness.
As with most highly technical in-the-field fixes this one was something to remember. My last act of “the ’85 CES show” became the simple motion of walking up to the “failed” computer station and pressing the key changing the C128 back to 40 column mode, especially important since it only had a 40 column monitor attached to it.
End of Line
Then something happened: We were done. I felt sub-processes actually end that had been consuming both CPU and I/O for months, I was suddenly unencumbered by the next “must fix”. I didn’t have a next task to pop from the stack… the phrase “End of Line” came to mind.
I was 24, in Las Vegas and had just delivered one of the major products for the best computer company in the world to the only show that mattered to us. I started walking towards the door with the uncommonly bright Las Vegas sun streaming through the windows. There were lines of people around the block waiting to enter, but the exit was completely unobstructed.
I buried myself in Las Vegas in a way that only youth, testosterone, and adrenaline can enable.
Making the Rounds
I won’t report here much of what all was done over the next days as I understand that for some things the statute of limitations never truly runs out, but inspired by [Mike’s] reporting of visiting the suites of the companies I will relate one small tale here: I had grabbed my best friend and fellow hardware designer who was the father of the 1581 disk drive, also successfully released on this day, and headed out. With the 6’8” [Greg Berlin] (grandson of the designer of the Curtis Wright P-40 Warhawk) in tow we started hitting the floors of the local hotels looking for the suites of the “important” companies that never managed to personally invite us. We had a secret weapon that opened doors as if bribed; not in Greg’s towering presence but in the simple phrase: “we’re from Commodore”.
Doors fully opened that had previously opened only 12-14 inches only to stop on the shoe of the doorman, and 5.25” floppies were stuffed in our pockets like the $20 bills of a VIP trying to impress his date. The suite that comes to mind was that of Electronic Arts (EA). With backslaps and copies of this year’s (and a few of last year’s) C64 game floppies shoved in our pockets we were welcomed like old friends; appointments were made and more than a couple of chugging contests were held. They lost or at least didn’t better us as we were young and full of testosterone.
As we made ready to leave the good folk of EA, after making sure that we would swing by their booth the next day (we did), they asked if there was anything they could get for us. This may sound like a strange or gratuitous question but I had already spied the case of Michelob (a beer from the early days of 1 micron silicon) and was pointing to it before the question was fully uttered. EA grabbed the case with no hesitation as I turned to face the door so he could set the case of teardrop shaped bottles on my shoulder for me.
Back out into Las Vegas we went with Electronic Art’s beer on my shoulder… It was a good CES.
Sometimes you come across a build so far along you wish you could go back and enjoy it just a bit at a time. This C65 build is so far along, it’s like binge watching a retro computer build. One that never actually existed.
Okay, that’s admittedly a bit rash. But technically the C65 (successor to the Commodore C64) never saw its way through development. A good place to start looking in on the build is from the second post way back in March. The FPGA-based project is already looking promising with proof-of-concept display tests. Are we the only ones surprised by the 1920 native display resolution?
The Wikipedia page on the C65 gives a good idea of how awesome this would have been back in the day had it actually made it to market. We suppose it joins the Commodore lists of would-haves and should-haves with the likes of the C128.