Amiga.org
Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Flashlab on September 10, 2005, 02:16:03 PM
-
Hi,
I've got a Scan Magic from DCE but it doesnt give any picture on my A1200 rev 1D4 motherboard but does work on my rev 2B board. Problem is that my 2B board has a broken mouse port so I want to use the 1D4 board in my tower...
Does anyone know what the problem could be? My 1D4 board still has the E123C and E125C resistors. But there is an extra resistor soldered on the board near Alice and something that's called XC3.
-
I don't think it really matters what revision motherboard you have. I have had no problems with rev 2,1d4 or 1d1 motherboards.
Is the scandoubler pressed firmly over the chip it sits on?
Loose contacts are the most likely candidate.
-
You were right!!
Just cleaned the contacts and pressed it into place a little firmer and presto!!
Thanks! I was afraid it was incompatible with rev 1D4.
Do you think I still need to do the timing fix? And do you know what the extra resistor is for?
-
Does anyone know what cable you need to connect the output of the scanmagic to the input of a graphics card? In my case it's a piccolo SD64.
-
Flashlab wrote:
Do you think I still need to do the timing fix? And do you know what the extra resistor is for?
Extra resistor? I don't know. What I do know is that commodore released boards that had patches applied to them. Commodore is not known for good quality control so slightly flawed designes made it into production and where pathched. My Rev 1D1 even has wires running over the PCB.
Anyway; timing fixes are not scandoubler related but apply to bus timing faults that occur when using 68040 or faster processors. Others seem not affected. Search te forum about these timing fixes/patches.
-
My 1D4 had the resistor you speak of, but did have the E123 and E125 removed (actually, looks as though it never had them in the first place). The scandoubler worked fine, but I had problems using a PC mouse adaptor (see my thread entitled "Mobo swap, RMB dead"). I never solved the problem and had to revert to a 2B (different to the first, and with another hack on the D215 chip near the TV modulator which doesn't exist on the 1D4, but not the timing hacks). My system is now back to "normal".