Simius

See PM

The configuration screen shows that the computer is running in PAL. This means you need a monitor that supports a vertical frequency of 50 Hz.

From rev.E upwards RD4 is on pin 37 and RD5 on pin 39.

It's CD4051 chips. They are CMOS, but not buffering the keys because they are only analog switches and behave as several hundred ohms resistor between active input and output. Relative tolerance to the keyboard mylar tracks oxidation is due to high impedance of POKEY inputs. In contrast to this, GTIA has internal strong pull-ups on the consol key inputs. Source current of the each consol key inputs is over 1.5mA (when shorted to ground). But the main reason of the consol keys failures is a PWR LED current. Because the consol keys and the PWR LED have a common ground track. The LED current is about 16mA. If the ground track resistance reach ~150 ohms the LED current will decrease a little (to about 11mA) but it's enough to completely cut off the consol keys. Because then the consol keys doesn't shorts the GTIA inputs to ground (0V) but to ~2V (counting also a serial 470ohm in-line resistors). You can reduce the LED current, you can buffer the lines, but these are all half-measures. Sooner or later you will have to replace the mylar anyway. Fortunately, they are available.

There are many cables on the market. DVI-Component: https://superssset.live/product_details/52766791.html You can also use a splitter cable: https://www.amazon.com/CGTime-Wyse-DVI-I-Splitter-Cable/dp/B07KXSSQFM and then a VGA to RGB-HV cable: https://www.elecbee.com/en-3035-vga-to-rgbhv-rca-connector-cable-hd15-male-to-5-rca-male-connectors-12-feet-long Links are examples. You can find better - cheaper and/or closer.

To be clear - the Sophia has three outputs - standard GTIA output (luma/chroma), analog output (RGB or YPbPr to choose in config) and digital (DVI). All three available at the same time. It means you can have the image on even four screens simultaneously, including TV set via RF (if you didn't remove the modulator).

It isn't a good idea. Commodore 1084s requires a TTL level csync that Sophia 2 doesn't provide. Shorting pins 2 and 4 causes the FPGA port (VSYNC) to be permanent overloaded. The only correct solution is to output the CSYNC signal direct from pin 15 (600/800XL, 65/130XE, XEGS), pin 6 (800), pin 4 (400/5200) or pin 12 (1200XL) of the CD4050.

To be clear, it was not my intention to take a position on US policy.

In fact, it was not my free decision, but forced by circumstances. Long story short - PayPal threatened me that if my sales revenue to US exceeded $600, I would have to deal with the US IRS. This is to result from the American Rescue Plan. I don't understand why, since I'm not an American citizen, but for some reason PayPal felt it necessary to inform me about this. Recently, while dealing with official matters, I had to testify whether I am not a United States taxpayer. Very strange. They didn't ask if I paid taxes in Papua New Guinea, New Zealand or Côte d'Ivoire, only in the US. This doesn't look good. Maybe they secretly want to make Poland the 51st overseas state of the US?

It's an op-amp and a Schmitt trigger. Both are still available. https://shop.tvsat.com.pl/en_GB/p/20pcs-B621D-TCA321A-DIP6-RFT/16494 https://shop.tvsat.com.pl/en_GB/p/10pcs-A302D-Amplifier-Sensor-TCA345-DIP4-RFT/11803

The same as before.

I will. Give me a moment.

There is no point in showing more than 6 digits. The best crystals have a stability of +/-5ppm. It means when you write 14.187576 then in fact the last 2 digit have nothing to do with reality.

I didn't order production. I bought in the store when were available.

I have several of them so I can send you one. PM sent.

You can always use cheap and easily available 17,73447MHz crystal and divide it by 5 and by 4 obtaining at once both, synchronous 3.546894MHz and 4.4433618MHz signals. https://www.mouser.pl/ProductDetail/IQD/LFXTAL011002Bulk?qs=e4%2FAndAAwgI7Ljo2GaL2HQ%3D%3D

You're right. It is as you wrote. But a long time ago, I was try a similar method with positive but practically useless result. Just because the calibration was needed. Cyfrowe dekodowanie PAL (Page 1) - Sprzęt - 8bit - atari.area forum

SMT assembly of the new batch is complete. THT assembly is currently in progress. One hundred boards are ready for programming/testing. Still needs to assemble a ribbon cables and a DVI boards. It's comming soon. The price will be lower than last time.

Sophia doesn't need any signal on pin 16 regardless of PAL or NTSC. The only things it need is a proper ANTIC and system crystal. 74LS74 and 4.43M crystal may or may not be present. It does not matter.

Unfortunately, it probably won't be possible before the end of year. The reason is in the attachment. This is PCBs tracking. Nothing like this has ever happened before. Several days ago I ordered the PCBs again with shipping via FedEx. I wonder which ones will come first.

XF551 use 8.333M crystal to sync with 300RPM standard PC drive. The nominal clock of the WD1772 controller is 8M. 300/288 *8 = ~8.333. This is only 4% but it make difference. 8.388M will probably work. It's only 0.6% deviation.

Only this one.

Ask xxl.

It's real, but it is not the Antonia. It's an old Antonia PCB with special core made on xxl's demand, working with Sally CPU.

Should be before the end of year.