Re: Superboard mods
Posted: Thu Mar 19, 2015 9:39 pm
well I found my box with the OSI stuff in it... broke out the board, found a 5 v supply and hooked it up.
Didn't have my old monochrome monitor but I plugged the RCA video jack into the old analog Video input of a modern LCD monitor and by surprise to me it came up. All 24 characters. Very sharp with square dots.
My video mod for 64 characters also came up running as nice as ever, which was a bit of a surprise consider the wires etc,
Also, it has a gated astable vibrator circuit to generate the new "dot clock", which is somewhat voltage dependent but it came up running without any adjustments needed. It has a pot to set it up right.
My next problem is the get the software needed to intercept the output to the video screen and put it into memory correctly so that the 64 character out comes out right. The mod works by interlacing the RAM from two consecutive video lines into one line and blanking the 2nd line when it gets to it. Really sweet. Output looks amazing. I will try to put together a post explaining how it works.
I made several mods to my superboard II so I'm trying to find out which are just for video.
will be back....glad to find that the old board works as always.....Sticky keys.....but banging them a bunch seems to clear it up.
Evan
Didn't have my old monochrome monitor but I plugged the RCA video jack into the old analog Video input of a modern LCD monitor and by surprise to me it came up. All 24 characters. Very sharp with square dots.
My video mod for 64 characters also came up running as nice as ever, which was a bit of a surprise consider the wires etc,
Also, it has a gated astable vibrator circuit to generate the new "dot clock", which is somewhat voltage dependent but it came up running without any adjustments needed. It has a pot to set it up right.
My next problem is the get the software needed to intercept the output to the video screen and put it into memory correctly so that the 64 character out comes out right. The mod works by interlacing the RAM from two consecutive video lines into one line and blanking the 2nd line when it gets to it. Really sweet. Output looks amazing. I will try to put together a post explaining how it works.
I made several mods to my superboard II so I'm trying to find out which are just for video.
will be back....glad to find that the old board works as always.....Sticky keys.....but banging them a bunch seems to clear it up.
Evan