VIDEO interface question
Posted: Thu Dec 06, 2012 5:53 pm
Hi,
What an incredible project Kiwi is! I happen to find it when I was googling about the Yamaha V9958, which I bought a couple pieces from eBay last night. Btw, the I got five pieces of CXA2075M for $10 (USD) shipping included. That was awesome! I am looking to do a VERY simple project to start learning about the V9958 and the V9990. I am planning use the ATMEGA1284 micro-controller as my "CPU" and hook to the V9958. Write some code and see if there is video on the TV.
A couple questions on the Yamaha V99xx series.
1) I HAVE to connect DRAM to the IC to use as VRAM? Or do I have to use special VRAM chips, like the one that Kiwi does? I thought the V9958, for example, had a 128KB VRAM built-in?
2) Is there a graphic library for the V9990?
3) Are the crystal speed for the V9990 and the RGB encoder IC independent of the CPU's speed? I think these crystals are for NTSC generation? In other words, if I used my ATMEGA2184 at 20Mhz, it really shouldn't matter with the V9990 and RGB encoder's crystal speeds?
Thanks!
What an incredible project Kiwi is! I happen to find it when I was googling about the Yamaha V9958, which I bought a couple pieces from eBay last night. Btw, the I got five pieces of CXA2075M for $10 (USD) shipping included. That was awesome! I am looking to do a VERY simple project to start learning about the V9958 and the V9990. I am planning use the ATMEGA1284 micro-controller as my "CPU" and hook to the V9958. Write some code and see if there is video on the TV.
A couple questions on the Yamaha V99xx series.
1) I HAVE to connect DRAM to the IC to use as VRAM? Or do I have to use special VRAM chips, like the one that Kiwi does? I thought the V9958, for example, had a 128KB VRAM built-in?
2) Is there a graphic library for the V9990?
3) Are the crystal speed for the V9990 and the RGB encoder IC independent of the CPU's speed? I think these crystals are for NTSC generation? In other words, if I used my ATMEGA2184 at 20Mhz, it really shouldn't matter with the V9990 and RGB encoder's crystal speeds?
Thanks!