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AuthorTopic: Pin 1 External Clock on Amiga video port  (Read 747 times)

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Offline save2600

Pin 1 External Clock on Amiga video port
« on: October 12, 2019, 01:54:34 PM »
In restoring an Amiga 1000 motherboard, I noticed pin 1 (XCLK external clock) is broken off. Wondering how important it really is before I look into replacing the port. Maybe it's only used with external TBC's?
« Last Edit: October 13, 2019, 01:32:11 AM by save2600 »

Offline paul1981

Re: Pin 1 External Clock on Amiga video port
« Reply #1 on: October 14, 2019, 07:02:12 PM »
I don't think you can call it 'restored' until you fix the broken parts.  ;)

Offline AndyFC

Re: Pin 1 External Clock on Amiga video port
« Reply #2 on: October 15, 2019, 01:20:17 AM »
The most useful info I could find about pin 1 is in this thread. In summary it looks like a way of using an external source to change the Amiga clock signal frequency; it affects the entire system but results in a change in Video signal frequency.


Are you planning on using a Genlock or switching between PAL and NTSC? Consider if you NEED this at the moment instead of taking a risk on the repair.
« Last Edit: October 15, 2019, 01:24:08 AM by AndyFC »
A1200 in DIY Tower. 3.0 ROMS (but 3.1 in RAM), 3.5" HD, CD Rom and IDE to SD adapter running off the internal IDE port (using the A4000 4-port IDE adapter from Amigakit), Blizzard 1230-IV, with 32MB 60ns RAM and 50MHz 68882 FPU. 3COM PCMCIA Network card running with Miami DX. https://www.youtube.com/watch?v=1PrGdL6XjmE
The following users thanked this post: save2600