Sinclair ZX80 / ZX81 / Z88 Forums

Spinnetti wrote: ↑Sat Sep 26, 2020 9:54 pm Thanks Will do... - Where's the "new games" topic?

It’s a sticky topic in this sub-forum.

I look forward to hearing more about your games progress

Mark

Hello and welcome to our forum Tom!



We certainly accept nerds here

Feel free to ask questions.

I hope you enjoy the forum

Mark

/STROBE pulses low to indicate to the printer to latch the data from the data lines (DATA0 - DATA7). In some printer interface designs, it’s a digital port output controlled by the software on the computer. But in some printer interface designs, it’s generated by hardware circuitry whenever the comp...

Hello and welcome to our forum Stephen! :D :D :D Please don’t be put off by what you see and read in the various posts. We have a wide range of members from all round the world, some of which are only just starting out with a Sinclair/Timex machine or compatible (be it a Zeddy, Spectrum, Z88, or va...

Hello and welcome to our forum Monty!



We like tinkering with hardware here

Feel free to ask questions.

I hope you enjoy the forum

Mark

It’s unlikely that reducing the value of capacitance will do any good. It’s possible that using a 100uF capacitor may help a little. Using a larger value above 100uF will not likely make much difference. As I said earlier, the main problem is the signal level being incorrect. Some TVs will be happy,...

Started off just messing about in order to test a machine. But ended up with this: 10 FOR a=0 TO 0 STEP 0: PAUSE 1: BORDER 1: BORDER 2: BORDER 3: BORDER 4: BORDER 5: BORDER 6: BORDER 7: NEXT a 20 PAPER 0: INK 7 30 BORDER 0: CLS 40 FOR a=0 TO 10 50 FOR b=0 TO 7: PRINT PAPER b;” ”;: NEXT b 60 FOR b=7 ...

What is strange is that the interference (for want of a better word) occurs exactly three times in the 52us of the visible part of the width of the picture (the visible part of a PAL tv line is normally 52us). If you do the calculations, that makes it a 57.7kHz signal. But what is unusual is that it...

Replace

Mark

Thanks Mark. I have some 47uF electrolytic capacitors - how do I connect one up? Connect the positive lead of the capacitor to the composite video output of the TFW8bit composite mod board. Then connect the negative lead of the capacitor to the centre terminal of the Phono/RCA socket on the modulat...