I am buying some spare parts of the TI99/4A to have them available for any repair needs. I have found some e-bay resellers in China with VDP chip, Clock generator, CPU and rams. I have tested successfully the VDP chip (does not look as a new old stock but a new manufacturing) but the clock generator fails (black screen and continuous tone on power up). Now I would like to be sure the one I purchase is the correct because the marking is different. The E-bay clock generator is marked TMS9904ANL while the original one is marked TIM9904ANL. Are they different then or is the e-bay clock generator a scam?