Sinclair ZX80 / ZX81 / Z88 Forums

So I originally put the 47pF in on the underside of the board directly to pin 27 and 29 with very short lead lengths (2mm or so). It's only since I've tried to put in a switch that I attempted to run long wires to one side of the cap (ie. one leg of the cap 2mm or so soldered to p27) and the other c...

OK, I've ran clkcfreq.p in instance 1. Pic is below. So yes you see the vertical grey lines for some of the special characters. I checked these chips and they are correct C21=74AC86 IC19=74AHCT74 IC9=74AHCT126 IC8=74AHTC08 I measured the resistance between IC15 pin2 and the via and it is 2k2. IC15 p...

I had a go at hooking up my logic analyser to the output of the 165 shift register (VIDP1 on your schematic) thinking there is probably some glitch occurring. I tried sampling at 100MHz and I see these regular spikes on the instance 0 screen. I guess 1.23us would be the char width at 6.5MHz Screen S...

So here's the whole screen. It's an old Dell 2001FP which I've used for ZXMORE in the past. Just looking at the photo again, it's interesting that the faint grey lines don't appear around all characters (eg. the numbers don't seem to have them, nor do the punctuation chars). It's not something to do...

Just tried the ZXMORE17.p update. Added the 47pf and followed the instructions in the user guide. All went well. However, I now get these faint grey vertical lines in the ZXMaster instance (which I never had before the update). They only appear in the ZXMaster instance. They don't appear in instance...