I just received a review unit of the Logitech K845ch mechanical keyboard. It has nice clicky keys, and lights under them. It can do five different light patterns at three different light levels. It’s interesting. One of the modes is a “react” mode so the key cap lights when you press it then quickly fades out.
I’ve missed these mechanical keyboards, so much. Thanks to Ed Snider’s work on the CoCoMech, I was made aware that they still exist. The unit I have used quiet switches, but I kinda want one with the loud clicking sound now… Fun!
I have posted a number of CoCo BASIC articles that used the example of bouncing a ball around the screen. I have a simple routine I use for this, which involves an X and Y location variable, and movement MX and MY variables that will be positive or negative for which direction the ball is moving.
To my surprise, I found nearly this exact code in the old VIC-20 manual as a bouncing ball example!
This code called it DX and DY (delta), but it’s basically the same code I’ve been using all these years. I had no idea I learned this from the VIC-20 manual back in 1982!
As much as it pains me to do so, I need the space and money more than I need all my 1990s Atari Jaguar stuff. I have eBay listings set up to sell my original (made in the USA by IBM) Atari Jaguar, the Jaguar CD unit, and all my games.
I even have a very rare add-on called a Catbox which provided all the various audio and video outputs as well as serial and the Jaguar network port. Mine was, I think, from the first run and was sent to me by the manufacturer as a thank you for some audio samples I contributed to a game they were working on. Fun times.
You can find my listings starting today at 6 p.m. PST here:
The replica Commodore VIC-20, known as TheVIC20, is not for sale in the USA and isn’t planned to be sold here. This is a limited edition version the C64 replica, TheC64, but in a VIC-20 enclosure with some different VIC software included.
It can be ordered from Amazon UK and shipped here, however, and then you use your own 1 amp USB power supply instead of the funky UK one that comes the box.
Although I don’t have one currently, one is being sent to me soon. So I started a users group…
A 1986 MacPlus on the FPGA MiSTer emulation hardware.
Earlier this year, I bought a MiSTer setup through Roger Taylor. MiSTer is an FPGA platform that can run recreations of consoles (Atari, Sega, Nintento, etc.), arcade games, and home computers (Apple, Commodore, etc.). Roger’s Matchbox CoCo FPGA project has been ported to it.
Here is the new Facebook group that covers all the various FPGA platforms Roger is working on:
I just unboxed mine and hooked it up the other night, and I am quite impressed. Being able to act as a virtualized hardware CoCo 3 as well as all the other machines is a game changer. Software emulators like MAME already let you do that, and I hope to do some comparisons between my Raspberry Pi emulator machine and this FPGA device.
And I still need to pick up a few more of the FPGA devices that can run the CoCo…
This writing is inspired by somethingI just saw in a YouTube video by 8-Bit Show and Tell:
In this video, Robin shows off an Easter egg found in the CoCo 2’s BASIC (the same one also found in the CoCo 1 since it was the same BASIC). He was wondering if there was any way to change the screen color (and I remember seeing someone ask this in the CoCo Facebook group but did not realize it was the Show and Tell guy). Australian programmer Nick Marantes gives him a “POKE 359,0:SCREEN 0,1” command to change the screen color… SCREEN can change the screen color? Surely I must have known this back then, but I had completely forgotten.
Thus, this article.
Nuclear Green CoCo Screen
The “nuclear green” screen of the Radio Shack TRS-80 Color Computer is certainly iconic. Black text on a green 32 column screen.
Disk Extended Color BASIC on the CoCo.
The Motorola MC6487 VDG chip contained a number of graphics modes, but only one text mode: 32×16 characters. The semigraphics modes supported up to 8 colors on the screen at the time, but text mode was limited to two colors: black on green. Well, except it was really a dark green on a light green. Here’s a zoomed in look, showing what color the text is compared to the black border:
CoCo “dark green” text on a nuclear green background with a black border.
I guess I sorta remembered this, because there was a way to invert the video to get light text on a dark background, and that background clearly wasn’t black:
Inverted text. Easy to do with a menu setting in the Xroar emulator.
I remember reading an article (probably in Rainbow Magazine) that showed how you could remove the VDG chip, pull up a pin, then plug it back in to the socket and get inverted video. I did that on my CoCo 1 since I thought that looked alot better (but not as good as if it was white on black like an Apple II or TRS-80 Model III).
The Xroar emulator has a menu option to toggle this inverted video.
But there was also a weird “pink” mode that I saw used in some early CoCo games. I recall reading a POKE or something that let you toggle it. You can also do that with the SCREEN command in Extended Color BASIC.
SCREEN type, color set displays the current graphics or text screen type is 0 (text screen) or 1 (graphics screen) color set is 0 or 1 Note: If type or color set is any positive number greater than 1, your computer uses 1.
Although not explained in the manual, you could select two color sets for the text mode. 0 was the normal dark green on nuclear green. 1 is the weird pink mode. But, when BASIC returns to the OK prompt, it resets the mode to 0, so you can’t use this to type things in (without a special POKE to bypass this reset). But, you can enter it in a program and then loop using a GOTO:
Alternate color set for text mode!
As soon as you hit BREAK and return to BASIC, the color resets to the green mode. The inverted mode looks like:
Inverted text color 1.
I don’t recall ever using this mode, though I do recall at least trying it out with the POKE.
I do not know how to invert the video in software, but I expect there is a POKE to do that.
Anyway, there you go… alternate color sets for CoCo BASIC that you can access from BASIC using the SCREEN command.
The great purge has begun! I have to downsize to about 50% of my current stuff, so it’s time to sell off all the CoCo gear I have that I will no longer be actively using.
First on the list is a Radio Shack X-PAD Graphics Tablet. This is still in the original box, with the original manual and template, as well as the plastic bags that came covering the pak and tablet! It’s as complete as it gets.
Next is the E.A.R.S. speech recognition system that was sold by Speech Systems. Yep, voice recognition on the CoCo! It could recognize 64 voice patterns, if I recall, and used simple BASIC commands to listen and match the voices. It needed a headset that was special so I don’t have a way to test it.
Then there is the Micro Works DS-68B video digitizer! Yep, the one with software that Tim Jenison (later of Newtek and the Video Toaster for Amiga) programmed! It works! But the label has come lose and will need to be “restored” with some glue.
Lastly, the Rulaford Research CoCo MIDI Pak with options — two switches that toggle the ports to THRU and OUT and such. I got this direct from Cecil Houk himself, and used it for years. I no longer have anything with MIDI, so … away it goes.
