Ok. Time for another sale.
I've got the standard sms1/genesis 1 mono cable. blah blah blah. $5 shipped.
Next up, I have a custom "Stereo" cable for sms1/genesis1. Ok, so it's fake stereo. It still makes your life easier. I build this one myself. $10/shipped.
Finally, I have a working RF adaptor for the ti99/4a computer. $5 shipped.
I built a video cable for my TI, which is why i no longer need the RF.
PM away. All shipping is first class USPS, btw.