NISMOPC Posted October 3, 2017 Share Posted October 3, 2017 (edited) OK, so this was a little project of mine. I bought this 600XL "untested". Found out the RF out was not working. Upon inspection imediately saw that a previous owner destroyed some of the RF modulator solder points. I initially planned on removing the RF modulator and adding the Monitor DIN out (same as 800XL), but realized that the area of the board where the DIN would mount was also mangled. I opted to add a basic A/V composite out using a 2N2222 transistor, a 2.2k Ohm resistor and a 3K Ohm resistor. (Pictured ==> The 75K Ohm resistor was removed. No need for this set-up.) This gave me VIDEO out and MONO AUDIO OUT via composite. My next upgrade was to install 64K RAM chips. Once that was done and tested I decided to see if I would be able to install a SIO2PC (real FTDI chip) inside the case of the 600XL. $100 + Shipping. (Does not include power supply, A/V cables, box or manuals. It will come with a female to male USB cable to connect to your PC.) The following is the results of my work. I tested this with a 1050 drive connected to SIO port at same time using RESPEQT fon my PC. To use the 1050 drive, I leave the DRIVE 1 open on RESPEQT and the 1050 will boot as normal. To use the SIO2PC, turn off the 1050 (or set it to DRIVE 2) and load a ATR to DRIVE 1 in RESPEQT. Normal operations as other SIO2PC. PLEASE NOTE: Due to complications with female plug, it was replaced with a male plug. You will see both in the pictures, but the final set-up is a standard USB male sticking out the back of the case. This will come with a female to male cable to connect from 600XL to PC. A/V Composite Out using the RF modulator case 64K RAM Upgrade Internal FTDI SIO2PC Complete Test screens and connections Edited October 7, 2017 by NISMOPC 2 Quote Link to comment Share on other sites More sharing options...
NISMOPC Posted October 3, 2017 Author Share Posted October 3, 2017 (edited) ...Still for sale Updated description. It's composite not component. Edited October 4, 2017 by NISMOPC Quote Link to comment Share on other sites More sharing options...
Bratwurst Posted October 3, 2017 Share Posted October 3, 2017 Exceptional work, well done! 1 Quote Link to comment Share on other sites More sharing options...
RodLightning Posted October 3, 2017 Share Posted October 3, 2017 Interesting approach. Thanks for sharing such high resolution pictures! I needed pics like that 30 years ago when I had similar RF modulator issues with my first 600XL! 1 Quote Link to comment Share on other sites More sharing options...
NISMOPC Posted October 5, 2017 Author Share Posted October 5, 2017 (edited) SOLD!!! Edited October 7, 2017 by NISMOPC Quote Link to comment Share on other sites More sharing options...
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