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The CLK pin of the 6845 seems to be connected to pin Q2 of a 74HC161 High-Speed CMOS Logic Presettable Counter.

Datasheet here.

I need to follow the tracks on the composite view of the Dragon Plus to see where the inputs are coming from.

Pernod70 wrote:I've no idea about the disk error though. Is there a FLEX manual anywhere?

You could try the FLEX User Group. There are two addresses, no doubt one is the mirror of the other.

http://www.flexusergroup.com/flexusergroup/default.htm

http://www.evenson-consulting.com/flexu ... p/fug1.htm

Alastair wrote:You could try the FLEX User Group.

Thanks, should prove useful. The error simply says DISK FILE READ ERROR, could the image be bad or do I have more issues, who knows!

Here's the Eagle schematic that I traced from my Plus board, this may be of some help.
Cheers.

Phill.