A little HELP!!

[Ramius]

Hi Henrik!
Thank you again! The xtal is 14.318. (NTSC) I have to go to the dentist today for a some surgery so I will look at the hex to binary after that. My guess is I am only looking at the last two digits, just the C5 in $1FC5?

[HenrikOlsson]

No, the registers are 16 bits wide, bits are labeled 0-15 (as usual) and you're interested in bit 8 (ie the 9th bit) which would then be the least significant bit in the high byte of the 16-bit Word. But really, look at it at as one 16bit value, convert the hex value you have to binary and compart at against the datasheet.

In fact, do that for "everything" and you might find something else that isn't right for your application - and you'll learn a lot.

/Henrik.

[Demon]

Code: is inserted by the system.

[ Code ] at start.
[ / Code ] at end.

without spaces

[Ramius]

Thank you! I forgot the brackets! Boy do I feel dumb! Back to the code, so I did a hex to binary and binary to hex and came up with $1FC5 should be $1085 and $1FD4 should be $1284. It did not make a change so it must be something else or I did not convert correctly?

[HenrikOlsson]

No, that doesn't look correct to me.
$1FC5 = 0001 1111 1100 0101
$1085 = 0001 0000 1000 0101

That's a lot more changes than one bit.

/Henrik.

[Ramius]

I probably tried to do too much at one time such as turn off the blinking, set it to mixed mode, etc.

[Ramius]

Okay so I did just the one bit change making it $1EC5. It helped. the $1FD4 I made $1ED4. Some how the video with text is being placed below the sync level! I can see sync, burst, and the video appears to be below the sync pulse! The sync pulse should be a negative .3 volts while video is positive .7 volts. Maybe I have a bad chip? There is also a "Mode Register" and I thought it had a value of $00CC and I think I am looking at the wrong register?