If anybody has done the hi-res or vga mod before that did not have a J78/J79 connecter on there CC a/b I would very much appreciate hearing from you. The instructions seem very cloudy about the whole sense line issue thing and I think that that may be a big part of my problem here.
Skipp
On Apr 18, 2004, at 5:36 AM, John F. Scipione wrote:
Well, onward I go with my color classic saga.
Firstly let me answer mouse1701's question. The connecter coming off the back of the CRT connects to a little metal tab on the case in the back of the a/b. I believe that it connects to ground. Despite what it looks like it does not plug into any 2 prong plug it just connects to a metal tab.
Ok, now my much more difficult problem. I attempted the high-res mod on my color classic. I followed Chris Lawson's instructions found here:
http://colourclassicfaq.com/highres/
I isolated pin 8 with a dremmel tool and connected pin 8 to pin 10 with a wire and solder. My color classic analog board does not have a J78/J79 connecter so I had to dremmel out the connection coming out of pin 20 on the a/b instead. When I reconnect the board and turn the color classic on I get a rhythmic beeping coming from something besides the speaker and the monitor does not turn on. I fear that I have done something wrong. Should I connect a 4.7k ohm resistor from pin 20 to +5V as Mr. Watanabe suggested? Has something more serious gone wrong? Does anyone know what a rhythmic beeping sound means? Does anyone have any advice on how I may be able to fix this?
Skipp
On Apr 18, 2004, at 4:21 AM, Stuart Bell wrote:
On 18 Apr 2004, at 02:20, mouse1701 wrote:
i had to replace the floppy drive..then i noticed when reassembling that a
plug from the back of the monitor ..hanging from the back of the rectangular
foil part was off..could not find where to plug it..diagrams i have do not
show where to reattach..it looks like a jumper plug..with two holes to fit
onto two pegs..but i cannot see it on the mobo..can anyone help..i don't
want to plug it in and try to run it and ruin the mac...thanks in advance.
_Sounds like_ the de-gauss cable, which plugs onto a two-pin PCB-mount plug just behind the A/C inlet on the a/b.
It's a polarised connection - only goes one way. If it fits OK, that's where it belongs. No CC a/b<->CRT connections can be crossed unless you're really brutal!
hth,
Stuart
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