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evlthecat

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evlthecat last won the day on May 7

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About evlthecat

  • Birthday 12/23/1970

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  1. Hail Cezar! **I couldn't resist** Glad you found the site, have a great time! Lots of friendly people, so if you have questions, feel free to head over to the Support Lounge. Have a great weekend!
  2. It really depends on what your personal goals are. I love programming in C, but decided that for a machine such as the commanderX16 it is impractical because of the overhead. If you have never programmed, I would suggest starting with BASIC and get a feel for the system. Then as you understand the memory mapping more and how to access it, move on. This could take as little as a couple of months depending on your dedication. If you are a seasoned programmer, or have a handle on one programming language, and understand how memory addressing and mapping works, go for assembly as @SlithyMatt suggests. There is nothing more frustrating for a beginner, then to drop themselves into something others perceive as easy, and become discouraged and quit. Small victories win the war! Have a great weekend!!
  3. Maybe it was PSpice? I remember that is what we used in Digital Logic..
  4. I need to get rid of the stock Debian version 2.7.1. The timing is horrible and the simulation stalls all the time. Makes for a really poor simulation experience. I am not sure if this was a symptom of the machine I loaded it on or the version itself. I believe the gent above eluded to running a beta version of 3.4.5 so I am sure many update have been made. I was impressed with the amount of components available for simulation. Thanks for piping in @JimmyDansbo
  5. I am not sure if many will be interested in this topic, but being a intermediate hardware guy I am putting it out there. While I was watching the Youtube I came across a gent, CuriousMarc, troubleshooting the D-RAM refresh circuit of his HP 9825. He simulated most of the shebang with this tool to help find the problem. I was impressed since the tool was user friendly, well documented and free. Link to git hub Logisim-Evolution. Evidently there is an alternate version called Digital based on the same original work. If someone tries that one let me know. https://mrmcsoftware.blogspot.com/2017/03/testing-and-improving-my-cpu-design.html
  6. 1) Mostly, people are involved with support software development for the future platform. The emulator can be downloaded via the 'Download' page, and follow the link for the cc65 cross-compiler development page. 2) The hardware development is out of our hands, as it being run by a core group driven by the 8-Bit Guy. See the 'X16 Discussion Lounge' for updates and to ask questions. 3) I will warn you, they are strict about the rules see the 'Main Forum' page at the ; and the hardware platform form factor is pretty much final, so discussing change ideas will be met with a lot of resistance. Have a great weekend!
    This game is pure evil! I had to get my 13 y/o to try and get past level 5 needless to say he rubbed it in mercilessly. However you have done a wonderful job propagating it to the x16!
  7. I will be honest.... I broke the seal..! (DOOM! DOOM! DOOM! ) and poked around. I did find something very curious on opening the lid. I guess someone on the assembly line autographed it?! Anyone ever run across this before? I did verify it does have extended basic installed and I found a Tandy TSB in regards to the 64K Byte memory and verified the RAM chips as 100% good; but for now, 32K will be fine. It seems very few programs utilized the CoCo 1 64k anyway. I decided to use a gentler approach with this CoCo, thanks to the poll above. Since all the necessary signals for composite are at you finger tips, I decided to build a piggy back circuit, which doesn't modify anything. That way, I can at least get it hooked up and running to verify it works, and fix it if it does not. Have a great weekend everyone!
  8. Looking great! Can't wait to see the new PCB, enclosure and it in action! Keep us updated.
  9. Bem vindo ao grupo. Se voce tiver qualquer duvida, e so perguntar. Tenha um otimo fim de semana!
  10. I love the Attiny85. Very easy to work with, has most of the bells and whistles its bigger brothers have, and very hard to blow up! It interfaces well with the I2C MCP23017 I/O Port extender if you need more room. I don't use Arduino software, but I would guess there is a library for it. If not I have written one in C if you are interested. I haven't had the time but elm-chan has put out a library to interface it with an SD card. The library is called Petit FAT File System Module. I used its bigger brother in the 2560 project. I love the challenge too, but I put things on hold so I could re-learn 65c02 assembly. I am going to take a couple of months to see where I can get with it, and then depending on where the commander X16 is, reevaluate. To many projects so little time! Wonderful, I will be looking forward to it. Might take a look at EasyEDA. Do you need to make a minimum purchase; as I remember that is what turned me off originally? You had to make a minimum order, and the price was steep compared to just making a perfboard prototype. However, this was several years ago. Thanks and have a great weekend!
  11. @Strider I would like to know how this works out for you. I have never done this either, and I would be curious to know if it is worth it. I am the same as you, always made my own boards. I thought about that new 3d board printer, but am very weary to sink high dollars into something for personal projects.
  12. My project arcade had 3 microcontrollers executing various functions all communicating via the I2C bus with the Raspberry Pi. The the first microcontroller is a Arduino Pro-Mini used to drive the arcade buttons, which interface with MAME. I have a script that decodes the MAME hardware setup file for each game and lights up the buttons according to how they have been programmed in the in-game control menu. The script also takes a default setup, so for all the other emulators I just hard code the button setup in. The second project houses the Mega 2560, which drives the scrolling LED display, and interfaces with SD drive for the display data for each programmed game. The short coming for this project is that I never off loaded the character set onto the SD card storage, so the character set is made up of only uppercase letters and stored in program memory, which eats all of the space. This interfaces with RetroPie, a script passes the data to a driver, which passes the game code via I2C to the 2560. I programmed in a clock w/ alarm, and this interfaces with the final project. The final project is another Pro-Mini, which drives an MP3 Audio Module and is loaded with various arcade sound clips. This plays, and the Pac-Man ghost eyes blink at random intervals. There is an IRQ setup when the programmed alarm goes off from the Mega 2560, or it can be controlled via momentary button push on the panel. The connection between the 2560 and the Pro-Mini was an after though hack, and overall the total project really needs to be re-written to be more cohesive, but hey its my arcade and not a commercial venture so it will probably never get done. I’ve move on.. I just finished at the end of the year 2020 a pwm joystick for the TRS-80 using an ATtiny85. The prototype seen, has two chips the final joystick has a single micro. That was a fun project! To get to the final design I had to build a high voltage serial programmer to program the fuses so I could use all the pins. That has a Nano driving it. I am currently redesigning the serial programmer board to include a serial debugger on the top section of the ZIFF socket so as I make changes, then I can move to the top part of the socket and test. I am hoping to make this into a plug in card for the commanderx16 someday.
  13. Great point @SlithyMatt. Honestly, I know this isn't some earth shattering find, and I really am not trying to make it into something bigger; It is a common machine and a later model TRS-80 Color Computer 1 for that matter. I am just curious if opinions differ. For instance, I am not a fan of Retro Brighting, but I would never begrudge someone doing it.
  14. Thanks for your thoughts @TomXP411. I was doing some reading on this model last night, and from what I understand it can be loaded with an extended basic ROM and may, depending on the memory chips, be 64k. But the only way find out is open it up. Right now it isn't a priority. I have 2x 64k Color Computer 2, and have one modified with all the bells and whistles. Like I discussed it just blew me away because it looks to be untouched. I have never seen this before buying secondhand equipment. It was truly a shame that the corner was busted, it would be a museum piece then. I am working on a Toshiba T1000 right now, so I am going to put this one away and keep it in its virgin state. Maybe somewhere down the road. I was more curious as to how other feel in reguards to older equipment, and their opinions on modifying it to make it more modern. I mean some of us probably came here because we watch retro youtube channels. Most of these gents, modify, retro bright, rebuild etc.. I was just wondering if there are others who are strictly opposed to these practices. Thanks for everyone who has participated!
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