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#6502 emulator ehbasic code
I do plan on cleaning up the code and posting it. I have to collect up the links for the EHBasic project and the Arduino project I based my modifications on. I did notice that splitting the address into two bytes by doing bitshift seems slow. I hope that the shift register performance isnt too slow. There seems to be some slower performance that I am tracking down. I then patched the emulator code to read and write to the RAM. I can come back later and add the shift register back. I started by writing a repeating but easily distinguishable pattern to the ram to make sure it can write to all the ram and read it back.
![6502 emulator ehbasic 6502 emulator ehbasic](https://mike42.me/blog/wp-content/uploads/2021/04/2021-04-8bit-table-tennis-fceux.png)
Autorepeat On ESC [? Interface On ESC [?Ī British -?I found the 74hc shift register was giving me fits, so I removed it for now and wired the data bus temporarily directly to the arduino to work through reading and writing to ram. ESC 3 Change this line to double-height top half -? AtMega328P загружаем BootloaderĮSC 4 Change this line to double-height bottom half -? ESC 5 Change this line to single-width single-height -? Ps m Ps refers to selective parameter. Or: what does this do exactly? ESC F Special graphics character set -? ESC 1 Graphics processor on See note 3 -? ESC 2 Graphics processor off See note 3 -? We don't support margins yet so the moves are absolute screen based character coordinates. Nonetheless, I'm proud to have come this far with it. Latest commit Fetching latest commit….Įxamples see demo.
#6502 emulator ehbasic download
Launching Xcode If nothing happens, download Xcode and try again.
#6502 emulator ehbasic software
Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. But some functions require some more hacking to implement with only 2kb of ram such as cursor blink and character deletion, to name a few. However, at the moment it can not really be called a vt terminal because it is far from complete in terms of supporting all of the vt terminal sequences.īut I do support a few and doing normal shell stuff works fine. The aim of this project is to be a vt compliant terminal. Note that because of the small size of the available memory and the slow speed of the microcontroller, it is a little tricky to implement all the escape sequences that are supported in vt Don't be put off by cmake. The emulator also uses ili display by default, but can be compiled to use another display with only a few changes to the source code. This is a vt emulator written for devices with under 4kb of ram for example the ATMega microcontroller. If nothing happens, download the GitHub extension for Visual Studio and try again. If nothing happens, download Xcode and try again. If nothing happens, download GitHub Desktop and try again. We have indeed come a long way.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. It is fun to think that the meager capabilities represented by an Arduino is able to simulate the silicon that was available back when I first started working with micro-controllers. I will provide some pictures as soon as I figure out what box contains that little treasure.
![6502 emulator ehbasic 6502 emulator ehbasic](https://mike42.me/blog/wp-content/uploads/2021/08/2021-09-6502-computer-assemble-03.jpg)
I still have my 6502 system built back in the mid-1970's. Cross-compilers and assemblers were built and utilized to program our new hardware. Bringing our loot home spawned a lot of effort to build and program working systems. At the time, Motorola was selling the 6800 microprocessor for a single unit price of $175 and ended up dropping the price to $69 in single unit quantities with further price reductions to follow.
#6502 emulator ehbasic manuals
The hardware and programming documentation manuals were another $10. I was at the time working for Hewlett Packard Advanced Products Division in Santa Clara, CA interestingly enough in the same group of teams that employed Steve Wozniak who later went on to found Apple Computer.Ī group of us went to the trade show in the fall of 1975 and were able to purchase the 6502 for $25. This was fun for me because my first experience with micro-controllers was when the MOS Technology 6502 was introduced at the Wescon trade show in San Francisco in 1975.