Chip16 Official thread (Development/Suggestions)

[tykel]

Great work on your game paul, good job.

That said, let's keep discussion on this thread related to Chip16.
Don't hesitate to open a new thread in this subforum!

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[paul_nicholls]

Thanks tykel! No worries, back to business now LOL

[sbeng]

Hi,
i have a question: every opcode is of 16 bit size?

[refraction]

correct

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[tronix286]

Originally Posted by sbeng

Hi,
i have a question: every opcode is of 16 bit size?

Nope. Every opcode have 32-bit size (4 bytes).

[refraction]

That'll teach me to post without thinking lol. It is 32, had 16 on the brain >.<

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My Chip16 Emulator RefChip16 http://code.google.com/p/refchip16/

[sbeng]

Hi,
thank you for your reply
I'm coding a simple CHIP16 emulator in C#.
First i did declare some variables:

private static short PC;
        private static short SP;
        private static short[] REG = new short[16];
        private static BitArray flag_reg = new BitArray(8);
        private static byte[] memory = new byte[65536];
        private static int[] color = new int[16]
        {0x000000,0x000000, //(Black)
         0x888888, //(Gray)
         0xBF3932, //(Red)
         0xDE7AAE, //(Pink)
         0x4C3D21, //(Dark brown)
         0x905F25, //(Brown)
        0xE49452, //(Orange)
        0xEAD979, // (Yellow)
        0x537A3B, // (Green)
        0xABD54A, // (Light green)
        0x252E38, // (Dark blue)
        0x00467F, // (Blue)
        0x68ABCC, // (Light blue)
        0xBCDEE4, // (Sky blue)
        0xFFFFFF
        };

        private static int[] opcode = new int[40]; //40 is temp number

Then did write a function for reading a ch16 file:

private static byte[] readRom(String path)
        {
            FileStream fs = null;
            byte[] raw = null;
            byte[] arrTemp = new byte[1];
            int pos = 0;
            try
            {
                fs = new FileStream(path, FileMode.Open,FileAccess.Read);
                raw = new byte[fs.Length];
                //header
                fs.Read(raw, 0, 16);
                PC = raw[10]; //initial value of PC

                //lettura contenuto del file
                pos = 16;
                while (true)
                {
                    int read = fs.Read(arrTemp, 0, 1);
                    if (read < 0) break;
                    raw[pos] = arrTemp[0];
                }
            }
            catch (Exception e)
            {
                Console.Write(e.ToString());
                throw e;
            }
            finally
            {
                if (fs != null) fs.Close();
                fs = null;
                arrTemp = null;
            }

            return raw;
        }

Then i did a start function:

private void start()
{
            byte[] rom = null;
            
            try
            {
                rom = readRom("C:/download/BC_TestRom.c16");
            }
            catch (Exception e)
            {

            }
            finally
            {
                rom = null;
            }


}

My question is:
after i have called readRom function, i need "copy" variable rom content in memory variable? If i'll read rom array (after 16th element) i'll can read opcodes?
Best regards,
sbeng

[refraction]

ignore the first 16 bytes of the rom and copy the rest in to the memory array starting at 0, worry about the header stuff later ;p

or you can do what i do and check the first 4 bytes to see if its "CH16", if it isnt, copy the lot starting at 0, if it isnt, skip the first 16 bytes then copy from there in to memory starting at 0.

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My Chip16 Emulator RefChip16 http://code.google.com/p/refchip16/

[sbeng]

Originally Posted by refraction

ignore the first 16 bytes of the rom and copy the rest in to the memory array starting at 0, worry about the header stuff later ;p

or you can do what i do and check the first 4 bytes to see if its "CH16", if it isnt, copy the lot starting at 0, if it isnt, skip the first 16 bytes then copy from there in to memory starting at 0.

if it is?

[refraction]

Originally Posted by sbeng

if it is?

if there is no "CH16" at the beginning there is no header, so just copy from the start of the file

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My Chip16 Emulator RefChip16 http://code.google.com/p/refchip16/

[tykel]

Originally Posted by sbeng

if it is?

Yeah, there's a typo there.
He just means only read from offset 0 if the first 4 bytes are 'CH16', otherwise read from offset 16 into your memory buffer.

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[sbeng]

I would to parse 2 ch16 types of file, one with CH16 header and one without.
Which files can i parse into Chip16 program pack 08.04.2011 (ie: BC_TestRom.c16 file seem to not contain header)?
Best regards.
sbeng

[refraction]

pretty much yes The newest pack from this year should have headers on everything, but its good to check just in case xD

Either that or just throw an error if the first 4 bytes arent "CH16"

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Dont PM me for help, use the forums, thats what its for!

My Chip16 Emulator RefChip16 http://code.google.com/p/refchip16/

[sbeng]

Do you have ch16 files with header yet so i can download them and test my project?

[refraction]

There are lots, just grab this http://forums.ngemu.com/attachment.p...5&d=1331761600

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Dont PM me for help, use the forums, thats what its for!

My Chip16 Emulator RefChip16 http://code.google.com/p/refchip16/

[sbeng]

Hi all,
in Chip16 documentation there is written:


Memory:
--------
64 KB (65536 bytes).
0x0000 - Start of ROM.
0xFDF0 - Start of stack (512 bytes).
0xFFF0 - IO ports.

I could to create a byte array of 65536 bytes then i write rom content in this array.

So i'll obtain follow schema:

memory array ---> contains ---->rom data + remains n zero values (in this 00000000000 section there is stack bytes and IO ports bytes).
Does the stack contain 256 items of 2 byte for each ones?
Is my schema ok?
Best regards,
sbeng

[refraction]

Yes, the stack stores the PC one on top of the other when they are added so a Max of 256 entries.

Yes the memory is just one huge chunk. just zero the entire thing on reset/startup, then load the rom in to the beginning of it, that's the easiest way to do it. then just keep a pointer for your stack and monitor it doesnt go above 0xFFED or below 0xFDF0

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Dont PM me for help, use the forums, thats what its for!

My Chip16 Emulator RefChip16 http://code.google.com/p/refchip16/

[tykel]

Just a quick shout to say exam period is over, so I have free time again. Yay!

So I'm currently working on my emulator again, which I'm rewriting from scratch. (The previous version was going nowhere and was getting hacky, so binned it)

I also want to write some more little games in due course... Something I want to try is compression, we'll see where that takes me!

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tchip16 (chip16 assembler) Js16 (browser chip16 emulator)
mash16 (chip16 emulator) img16 (chip16 sprite converter)
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[sbeng]

Hi,
about Chip opcode documentation of page 1 there is written:

B3 YX 00 00 SHL RX, RY Logical Shift value in register X left by the value in (RY & 0xf). Affects [z,n]
B3 YX 00 00 SAL RX, RY Arithmetic Shift value in register X left by the value in (RY & 0xf). Affects [z,n] (same as SHL)

My question is:
how can i know which type of B3 opcode (logical or arithmetic) i need to decode?
Best regards.

[refraction]

Its the same thing when shifting left as you're pushing out the sign so just use the same opcode

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Dont PM me for help, use the forums, thats what its for!

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