Search found 9 matches

by unebonnevie
Fri Nov 03, 2017 6:46 am
Forum: Hardware
Topic: Gerber files for the Kiwi computer?
Replies: 2
Views: 12385

Gerber files for the Kiwi computer?

Hi,

Do you give out the gerber files for the Kiwi computer?

Thanks!
by unebonnevie
Wed Jan 20, 2016 6:47 pm
Forum: Hardware
Topic: CXA2075M RGB encoder question on the SYNCIN signal
Replies: 4
Views: 22182

Re: CXA2075M RGB encoder question on the SYNCIN signal

SYNCIN is the input for a composite sync signal with TTL level voltage. This signal is generated by the VDP. Thank you. And sorry for such a noob question here, but, the composite sync signal here refers to which part of the NTSC or PAL signal? I am trying to see if I can generate such signal using...
by unebonnevie
Sat Jan 16, 2016 4:52 pm
Forum: Hardware
Topic: CXA2075M RGB encoder question on the SYNCIN signal
Replies: 4
Views: 22182

Re: CXA2075M RGB encoder question on the SYNCIN signal

Hi, Please explain what kind of signal input to the CXA2075M RGB encoder's pin 10, the SYNCIN? Is it a toggle input, that is, off/on? Greatly appreciate it if you could point me to the code to further understand how the input signal to the SYNCIN pin is generated. Thank you! Also, 2nd part to my qu...
by unebonnevie
Thu Jan 14, 2016 10:31 pm
Forum: Hardware
Topic: CXA2075M RGB encoder question on the SYNCIN signal
Replies: 4
Views: 22182

CXA2075M RGB encoder question on the SYNCIN signal

Hi,

Please explain what kind of signal input to the CXA2075M RGB encoder's pin 10, the SYNCIN? Is it a toggle input, that is, off/on? Greatly appreciate it if you could point me to the code to further understand how the input signal to the SYNCIN pin is generated. Thank you!
by unebonnevie
Fri Dec 14, 2012 9:04 pm
Forum: Hardware
Topic: VIDEO interface question
Replies: 9
Views: 27598

Re: VIDEO interface question

Where did you buy your parts? Maybe the source could be interesting for us? On eBay :-) Just search for the parts I mentioned. I usually go to eBay and check for parts. Compare prices to digikey.com if possible. The problem with eBay is that, if you're lucky, you find the parts, and they could run ...
by unebonnevie
Fri Dec 14, 2012 12:54 am
Forum: Hardware
Topic: VIDEO interface question
Replies: 9
Views: 27598

Re: VIDEO interface question

I have handful of TI TMS4464 DRAM (64K × 4), which I can use for the V9958. 4 pcs would give me 128KB of video RAM. Sounds good to me. Maybe you could reduce the needed parts with 64k x 8 DRAMs, but for testing I would use what I have. Very hard to find 64Kb x 8 DRAMs -- only 256K x 4, but that doe...
by unebonnevie
Fri Dec 07, 2012 6:46 pm
Forum: Hardware
Topic: VIDEO interface question
Replies: 9
Views: 27598

Re: VIDEO interface question

This is a good question. The 4.433618MHz is exactly the PAL subcarrier frequency. It is used by the RGB encoder to modulate a PAL composite video signal. The subcarrier oscillator should be changed to 3.579545MHz for an NTSC composite signal. Uhmm, this should be changeable for a next revision Kiwi...
by unebonnevie
Thu Dec 06, 2012 10:40 pm
Forum: Hardware
Topic: VIDEO interface question
Replies: 9
Views: 27598

Re: VIDEO interface question

On the DRAM part, the V9958 data sheet says the below in order. I take this means that the V9958 can have up to 12KB of DRAMs attached to it? Because the V9958 is able to display 512x424 resolution with 16 colors per pixel. This means the memory requirement for the video is at least ((512 * 424 * 4)...
by unebonnevie
Thu Dec 06, 2012 5:53 pm
Forum: Hardware
Topic: VIDEO interface question
Replies: 9
Views: 27598

VIDEO interface question

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 lea...

cron