Well, got the Falcon Service Manual and reversed the rest of the Nemesis install. Had to reinstall 3 resistors that were removed for the Nemesis. Tried powering up the Falcon. There is life in there but not getting a display. At least I know I'm on the right track and I got some kind of response.
I am now looking for a Falcon test cartridge to run service diagnostics on it. I have the test fixture board and cables but the Falcon takes its own test cart. If anyone knows where I can find one (Best is out right now), either for sale (preferably) or to borrow, let me know.
She Will Live!!!
I'm impressed by your work!
* For what it's worth to those reading this (other than Guitarman), I was the original owner of this Falcon.
So, it would appear that it wasn't the Nemesis after all (or the DMA chip, which was my guess).
Are you getting anything on the monitor when you power up? I would get a white screen, and maybe 1 out of 30 tries, the Falcon would boot to the desktop normally.
When I attempted to bypass certain features of the Nemesis temporarily (the acceleration of the DSP, and then the DMA), I would get a black screen. Based on comp.sys.atari.st user suggestions, I was intending to replace the DMA chip (which is why it was removed from the motherboard when you bought the Falcon). I'd rather not talk about the mess I made during that procedure, but... moving right along...
I did not have a Falcon test cartridge either, and pretty much gave up at that point. So, I'm following this thread with great interest. And I wish you the best of luck!
Not getting anything on the monitor other than, with my VGA flat panel connected, I get an 'unable to sync' error. The good thing is, it must be getting something to throw the error. I did try connecting to my TV with the RF out and got various reactions to turning it on. Mostly a black output with vertical scan lines through it, kinda like bad vertical hold. Every so often it will throw a blue screen but with the same skewing. Never a legible picture or desktop though. I did discover that there is a broken pin on the monitor connector which could have been part of the original issue. That will be an issue as I can not find a male 19pin D-Sub connector anywhere!!! The female ones are easy, straight out of an old MAC floppy drive!! I am either going to install a female connector to the mainboard and make a male DB19 to VGA adapter or I may just install a VGA port in it since I don't see myself ever using something else.
As far as proceeding, I have everything to start testing, minus the Falcon service cartridge, an that should be here in the next day or two. I have all the service diagnostic boards and carts for all the other ST/TT/Mega systems now that I got from an old Atari service center in San Diego. I actually have 3 complete diagnostic board sets w/cables so I may be posting up a couple here soon. I'll tell you, the Falcon service manual has a plethora of cool info!! A lot of very valuable information.
I'll keep you updated.