Ham Radio Ten Meter Beacon Station

Discuss anything related to the VIC
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Leeeeee
soldering master
Posts: 396
Joined: Fri Apr 23, 2004 8:14 am

Post by Leeeeee »

Looking a bit more closely at the code there seem to be at least two points at which the code tries to alter a RAM image. One increments a table byte that I think may effect morse code timing and one changes a code byte that would corrupt ASCII to CBM character translation.

Neither of these looks accidental.

Lee.
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CrAlt
Vic 20 Drifter
Posts: 35
Joined: Mon Oct 27, 2008 4:06 pm

Post by CrAlt »

Leeeeee wrote:
Neither of these looks accidental.

Lee.
So it might be copy protected?

i added 00 A0
popped in my vic-1111 16K ram cart.
load "radiotap",8,1
sys40960

and get a READY.
:(
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Leeeeee
soldering master
Posts: 396
Joined: Fri Apr 23, 2004 8:14 am

Post by Leeeeee »

So it might be copy protected?
It certainly looks like it.
i added 00 A0
popped in my vic-1111 16K ram cart.
load "radiotap",8,1
sys40960

and get a READY.
Does the VIC-1111 allow you to add RAM in BLK5, $A000-$BFFF ? I thought it was mapped to BLK2 and BLK3.

Admittedly I've not tried it on my VIC, I don't have a BLK5 RAM cart handy, but it works in Vice.

Lee.
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Leeeeee
soldering master
Posts: 396
Joined: Fri Apr 23, 2004 8:14 am

Post by Leeeeee »

So it might be copy protected?
Not might be but definitiely is. I've found other code that checks to see if this code has been altered and if it has it deadends.

Sneaky, but no match for modern tools. 8^)=

Lee.
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CrAlt
Vic 20 Drifter
Posts: 35
Joined: Mon Oct 27, 2008 4:06 pm

Post by CrAlt »

wow...

What the heck is even the point of putting copy protection in? This software is useless with out their interface box... and the interface box came with the software. :roll:
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Leeeeee
soldering master
Posts: 396
Joined: Fri Apr 23, 2004 8:14 am

Post by Leeeeee »

This should be a fixed version of radiotap that can be autostarted from RAM in BLK5 - $A000, or, after removing the two load address bytes from the start, can be used as an autostart cart image.

Lee.
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CrAlt
Vic 20 Drifter
Posts: 35
Joined: Mon Oct 27, 2008 4:06 pm

Post by CrAlt »

Leeeeee wrote:This should be a fixed version of radiotap that can be autostarted from RAM in BLK5 - $A000, or, after removing the two load address bytes from the start, can be used as an autostart cart image.

Lee.
Wow you da man!

Thanks for hacking that for me. I tryed it in VICE and got it to go. Now i just need to get ram at blk5 in my VIC. I guess the VIC-1111 cart puts nothing there.

Again, thanks!
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channelmaniac
Vic 20 Hobbyist
Posts: 105
Joined: Tue Jun 17, 2008 8:21 pm

Post by channelmaniac »

It's pretty simple to hack a 2764 based 8K ROM cart to add a RAM chip to that area.

You'll need to cut the trace to pin 27 on the EPROM and wire that to pin 17 of the cart edge connector to get the read/write signal to the chip. Make sure pin 26 (Chip Enable 2) and 28 (power) are still connected to +5v, pin 20 (Chip Enable 1) is grounded, and pin 22 (Output Enable) connects to pin 13 on the cart edge connector.

The address and data lines are the same.

RJ
Call me a cheap bastard... I learned to fix things to save money... even surface mount soldering...

Visit my website: http://www.arcadecomponents.com
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Leeeeee
soldering master
Posts: 396
Joined: Fri Apr 23, 2004 8:14 am

Post by Leeeeee »

Wow you da man!
Yes, yes I am. 8^)=
Now i just need to get ram at blk5 in my VIC. I guess the VIC-1111 cart puts nothing there.
From what I have read of the VIC-1111 it puts RAM at BLK2 and BLK3 and can be used with the VIC-1110, which puts 8K of RAM at BLK1, to give a full 24K expansion.

If you feel competent to do so you could open up your VIC-1111 and rewire it to move the 8K of RAM at BLK3 to BLK5. It should just need one cut and one jump to do it. As you can see here I'm quite happy to mod my own carts. 8^)=
Again, thanks!
Meh, it was fun. I like taking things apart and putting them back together again, hardware or software.

Speaking of hardware I would like to know more about the Kantronics interface. I don't suppose you have a schematic for it and the cable to the VIC? Even pictures or scans of the top and bottom of the PCB(s) would be nice.

Lee.
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CrAlt
Vic 20 Drifter
Posts: 35
Joined: Mon Oct 27, 2008 4:06 pm

Post by CrAlt »

6502dude filled me in on the hardware section on how to setup my vic1111 for blk5 so i should be able to get my vic on the air.

All i have is the interface unit and the cable that hooks it up to the VIC via the joystick port. No docs or anything. I will open it up and snap some pics for you this weekend when i start messing with it again. The connections to the radio are simple since it has labeled phono plugs on the back.

http://www.rossdist.com/shopping/pricel ... ?prid=5628 sells them but i dont know what they come with
http://www.eham.net/articles/7305 is a story about hooking it up to a rs232 port
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Leeeeee
soldering master
Posts: 396
Joined: Fri Apr 23, 2004 8:14 am

Post by Leeeeee »

I will open it up and snap some pics for you this weekend when i start messing with it again.
Ta in advance for that.
6502dude filled me in on the hardware section on how to setup my vic1111 for blk5 so i should be able to get my vic on the air.
So I have since seen. That, BTW, is what my cart looked like before I modded it.

Lee.
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vk4akp
Vic 20 Drifter
Posts: 36
Joined: Tue Aug 28, 2007 4:53 am

Need new link.

Post by vk4akp »

The YouTube video has been removed.

Anyone got another link to it?

I'd love to watch it.

Ken - vk4akp
.-.-.
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