![6502 emulator ehbasic 6502 emulator ehbasic](https://aws1.discourse-cdn.com/arduino/original/4X/c/0/5/c058e48547dc7a46832cb444f816656b6eb8c2fc.png)
- #6502 EMULATOR EHBASIC HOW TO#
- #6502 EMULATOR EHBASIC SERIAL#
- #6502 EMULATOR EHBASIC MANUAL#
- #6502 EMULATOR EHBASIC PATCH#
![6502 emulator ehbasic 6502 emulator ehbasic](https://aws1.discourse-cdn.com/arduino/original/4X/e/6/4/e64b14760db0e43a4ecdcbf4d0c316d49036bfce.jpeg)
VRAM is a temporary video memory holding “old” characters. This is the version with transferring deltas only from C64 video RAM to the VT100 terminal (25 rows x 40 columns). PS: The test for reference: 5 REM PITO'S TRIGONOMETRIC FUNCTIONS TEST 0.89 DEGREEħ REM BASED ON WELLKNOWN "9 DEGREE" CALC FORENSIC TESTĨ REM ASIN(ACOS(ATAN(TAN(COS(SIN(9.0)))))) = 9.0 IN DEGREEģ0 DEF FN ACS(X) = PH-ATN(X/SQR(1.0-X*X)) :) Unless the mips compiler is a crap I would estimate 19.9 secs for your code in the DUE.
![6502 emulator ehbasic 6502 emulator ehbasic](https://i.ytimg.com/vi/be8CF_QYjgk/maxresdefault.jpg)
So it seems there is an issue somewhere (provided mips is ~20% faster than arm and my clock is 30% more yours) :) For example, if you do not switch CapsLock on, it returns in 1 sec as it does not run the code (the code is empty). I only read the first half of the bottom line to eliminate video.
#6502 EMULATOR EHBASIC SERIAL#
That way you don't have to worry about any problems with using an actual keyboard.I ran it on pic32mx Fubarino o'clocked 120MHz (compiled with chipkit's compiler, USB serial com), and the below trigo test took about 10secs (C64 V2 ROM). Your keyboard polling thread should place the keystrokes read in $F004 (and after a while clear F004 again - if I understand the instructions).Īs a debugging tip: In you first version simply have a string with a fixed input such as 10 print "hello" 20 goto 10 and feed $f004 from there. Reading the question/answer you linked to, I see it is a modified ehbasic. Then let the polling thread push any input key strokes into a small buffer from which the ehbasic input routine can use. One thread that runs the emulation of the 6502 running ehbasic and another thread that polls the keyboard. One way to deal with this is to use two threads. First test was with a 32k x 8 SRAM (HM62256) and fake6502 running EhBasic. Should be placed in A and the carry flag set, if there is no character then A, This is a spacetime emulator use, space because in-circuit, and time because. This is a non halting scan of the input device. A fun language compiler for 8-bit systems (6502, 6510, Z80, Atari, Commodore, NES, ZX Spectrum, Atmos) with great optimization. cc64 is a small-C compiler written in Forth, hosted on the Commodore C64, Plus4 and C16 with 64k, and on the Commander X16. The interpreter calls the system routines via RAM based vectors and,Īs long as the requirements for each routine are met, these can be changed The Top 8 Compiler 6502 Open Source Projects on Github. crustacean6502emulator, 6502 emulator using nightly generators to provide cycle acurate.
#6502 EMULATOR EHBASIC MANUAL#
In the manual of ehbasic it says: How to. The Top 8 Compiler 6502 Open Source Projects on Github. I see you use getchar in the code and if I remember correctly that is a blocking call (it will wait until someone presses some key). I want to know an effective method of entering a string of characters, and getting passed "memory size?".Īdditionally, if I want to let EhBASIC calculate the memory size automatically, what should I input to $F004? I can't let EhBASIC know when to stop receiving inputs After the program asks for memory size, giving any input will just cause a loop of reading from $F004 (LDA $F004) - i.e.Input is only possible through individual letters (Expected).But my current code seems to have two problems: while(1) He later went to MOS in order to implement his vision of an 8bit CPU for way less than 300, which was Motorola’s price for the 6800. Peddle was one of the engineers that developed the 6800 at Motorola. Turns out the method I used to select the ram, is similar to how you would do bank switching on an Apple II.
#6502 EMULATOR EHBASIC PATCH#
This post states that whenever EhBASIC wants input, It will poll $F004. Chuck Peddle, the main designer of the 6502, has passed away on Dec. Once I have that working I can patch the 6502 emulator to use the external ram instead of the microcontroller ram.
#6502 EMULATOR EHBASIC HOW TO#
However, I have no idea how to emulate the input process. With EhBASIC, I've managed to get some output by printing the value of $F001 when a read is done to that address.
![6502 emulator ehbasic 6502 emulator ehbasic](https://1.bp.blogspot.com/-7b3_ktn-YRY/XRPRrb9gijI/AAAAAAAAKyY/xvlIH4LT8_wUnLnHClUHY8M9wOpz8cs7QCLcBGAs/s640/ehbasic%2Bin%2B6502%2Bemu.png)
Although it lacks precise clock timing, the emulator did pass AllSuiteA.asm. I have been working on this 6502 emulator for a while, and I'm tying to get a simple Enhanced BASIC ROM to work.