Search found 104 matches

by russellnash
Thu Mar 28, 2024 5:33 am
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 718

Re: No clock signal to the Shifter

Thanks for confirming that.
by russellnash
Wed Mar 27, 2024 12:33 pm
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 718

Re: No clock signal to the Shifter

With respect to the possibility of using either 2 or 6 chip TOS on this type of board I noticed something that got my attention. On the original 520ST schematic pin 22 OE of the TOS Roms is connected to UDS and LDS and also to the cartridge port. However, on the schematic for the 1040ST the TOS Roms...
by russellnash
Wed Mar 27, 2024 7:19 am
Forum: EXXOS WEBSTORE INFORMATION
Topic: Royal mail getting rid of CN22 now it seems
Replies: 9
Views: 186

Re: Royal mail getting rid of CN22 now it seems

I have already seen sellers refusing to ship either into or out of the so called European Union, citing complicated customs declarations. I don't blame them, such controls are not in the interests of businesses or customers.
by russellnash
Sat Mar 16, 2024 7:35 am
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 718

Re: No clock signal to the Shifter

After I replaced L22, R86 and R91, which are the three components between Y2 and Y3 on the photo, the input and output of the Shifter both oscillate on the logic probe, at the MMU, GLUE and CPU etc.
by russellnash
Tue Mar 12, 2024 6:57 am
Forum: HARDWARE ISSUES
Topic: 520st stopped recognising my gotek
Replies: 22
Views: 919

Re: 520st stopped recognising my gotek

Seeing this thread inspired me to do something that I had been putting off for a long time, namely fixing up an external Gotek for my 520ST which isn't suitable for most of the Atari games adapted games on my Ultrasatan because few of them work with just 512K of RAM. One that comes to mind that does...
by russellnash
Thu Mar 07, 2024 7:32 am
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 718

Re: No clock signal to the Shifter

You shouldn't be worried about offending me, there is no such thing as causing it, only taking it. :D I ask questions because I would like an answer and answers that are relevant and truthful are the best answers. I already know more now from your comments than I did before. There is probably a good...
by russellnash
Wed Mar 06, 2024 1:03 pm
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 718

Re: No clock signal to the Shifter

I have only a logic probe and multimeter. I have some pulsing on the output of the shifter. The shifter is confirmed functioning. I have no way of knowing which way round my transistors collector and emitter are so, I just tried swapping round Q8. I ended up with pulsing at pin 2 but nothing out at ...
by russellnash
Tue Mar 05, 2024 6:54 am
Forum: HARDWARE ISSUES
Topic: 520st stopped recognising my gotek
Replies: 22
Views: 919

Re: 520st stopped recognising my gotek

Here is a source of external floppy adapters in case you need it.
by russellnash
Mon Mar 04, 2024 2:50 pm
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 718

Re: No clock signal to the Shifter

Thanks for the short explanation Stephen, it helps because I don't always understand what's going on when I look at a schematic. My electronics knowledge goes back to 1987 doing "O" level with relatively little experience since. I will have another look and fiddle around in the next days.
by russellnash
Mon Mar 04, 2024 2:19 pm
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 718

Re: No clock signal to the Shifter

Thanks for the replies. The board certainly appears to be designed to use two chip TOS, but I could try it with six chip also. The L18 inductor which does look dark grey in the middle is not open circuit, but I could replace it anyway. Most of the transistors are new because they were missing. I hav...

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