Taijigamer

Cords for rf output? Savage.

If it's on dash 7371 then definitely jtag it. Instaboot every time.

You're welcome =) Glad u got it sorted.

Use sheet 6 of the Colecovision service manual to help troubleshoot the issue. http://www.colecovisionzone.com/photos/coleco/colecovision%20tech4.pdf. Check 5V on pin 16. Check that pin 5 & 6 go low when playing game. Check pin 14 for clk signal. It may be a bad sound chip. This thread details a similar issue. http://atariage.com/forums/topic/214438-colecovision-no-sound-problem-help/

U can also RGB mod your CDi for maximum picture quality. This will also solve your B/W picture issue. http://retrorgb.com/cdi.html

I thought the kanji rom needs to assigned to 'Font ROM' and then a known bios rom used for Bios, in phoenix. Maybe the same for SAOT. Phoenix may treat anything from ROM2 as the 'FONT ROM'.

If I remember correctly, pheonix emulator runs the Kanji rom alongside the bios. Maybe 3doplay isn't setup to use the kanji bios. Maybe try running it in Phoenix.

Check the power connector at the back of the console, the plastic housing will tell u what revision it is (check online). A jasper psu won't connect to a Falcon board because of the connector housing. If u are having to throw so much cooling at it then there is something more going on. What heatsink paste did u use, are the heat sinks making good contact? Are the x-clamps still in situ?

If you live in the UK and want someone to have a look at it, I would be happy to do so.

Did you consider getting those systems RGB modded? NTSC is a preferred format anyway, less timing issues with gameplay.

Cool, looks like you already have all the Bios that I have. If I come across any more, I'll send them your way.

Wow that is dedicated. That's a cool project. I've PM'd you some info that may be of use. If I have any more info I will post in your hardware thread so as not to digress this thread. Thank you for the really useful information. It would be interesting to see inside the console to see how the switch connects to the ROM chips. Is CE lifted or does it use the connector pads in between the 2 chips?

Panasonic_FZ-1(Service_Manual).pdf That's cool that you have taken on the task of improving 4DO. I can't help with the bus protocol but here is the FZ-1 service manual (PAL) which may help with the hardware side. I've also got a few retail bios if that's useful (FZ1, FZ10, ANVIL, Kanji, GDO, Sanyo).

Glad you were successful. How did u find the pinout of the chip? I can't find a datasheet online. Which chips did u find as direct swap? Interestingly, the FZ-10 has a 6 pin header near the bios rom which may allow ICSP programming of the bios or Rom2 at factory. The FZ-1 has some solder points as well which seem to connect to the ROM1 or ROM2. If you are successful then it will be possible to flash any rom we want to the 3DO. There is a 3DO testing station which has a switch on the back for switching between encrypted and decrypted code. I haven't been inside one to see but I would guess it has 2 Roms piggybacked with a switch.

How were u trying to read the ROM chip? I tried to find the datasheet on the ROM chips but couldn't find anything. I found a Kanji rom online which I use with phoenix emulator. I'm assuming its the same SOP44 compatible rom. rom2.rom

Do you have access to an O-scope? Maybe it's a problem with the 7805 regulator or a bad RAM chip.

The Genesis was my first console and I've always considered myself a sega man before switching to psx in the late nineties. There is a certain novelty to the 32x sega cd combo. It was the first 32 bit cd based system to properly handle 3D graphics. The Panasonic 3DO released in 1993 but didn't have true 3D graphics ability. The 32x has the same cpu as the Saturn but considerably less ram. There are a few games (6 I think) that were specifically developed for the 32x sega cd combo. It will definitely make a great addition to your retro collection and still a lot cheaper than a wondermega or x'eye.

That's interesting. That suggests a sync issue in the video signal which might explain why your Tv won't detect picture, or only show it randomly. I would try and replace the cap on the video line. It's a 220uf cap near the cxa-1145 chip. The schematics show it as C32 but yours might be slightly different. The resistance test doesn't show whether a cap has gone bad. U need an ESR tester which can be expensive. I just troubleshoot down to the likely cap and replace it.

Sounds like u have eliminated everything else. It might point towards a malfunctioning video DAC. I would eliminate caps first. A bad cap doesn't always look like a bad cap. What model Genesis 1 do u have. There should be a decoupling cap for the CXA1145, maybe try replacing that first.

A google search turned up this 3 output LDO regulator which may solve your 1.8V, 2.5V, 3.3V issues. http://www.farnell.com/datasheets/2254556.pdf The official documentation for 3DO states the graphics resolution as 320x240 which is then output at 480i by the native encoder. The CH7025 outputs 480i SD and 480p ED etc. It will be interesting to see how the encoder handles the resolution. Programming of the chip seems to be done over I2C serial programming. I found some files here http://en.pudn.com/Download/item/id/2626071.htmlWhich may help with programming the chip. HDMI? Now that sounds interesting. Maybe look at how OSSC works or speak to @citrus3000psi on his work.

I think my wife has a fix for all my electronics too :-/ Maybe try this https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F173250785112 Not sure how reliable they are.

Hey man, welcome back. Hope the surgery went ok. When I measured H, V, CLK, D23:0, I had values of 1.4V, 1.4V, 2.4V and 20mV respectively. These were DMM values but the true oscilloscope values shouldn't be far off. H and V are outputs on the original encoders which feed back to the CLIO so using them as inputs may be out of sync with the D23:0 info, but they can be set as outputs on the CH7025. Csync can be set to either XOR, AND, OR. At least the horizontsl shift will be sorted. Looking at the output standards it looks like the CH7025 doesn't output 240p. It outputs 480i but also 480p, 720p etc, I wonder if it can upscale the 3DO D23:0 information? I'm the same when prototyping, include everything then downsize. U could probably remove a lot of the filter discretes and just use a 75 Ohm termination resistor and 220u cap on the RGB lines. No need for H, V out, just Csync. The challenge will be cleverly designing the psu section due to space. Maybe an IC devoted to 1.8V, 2.5V and 3.3V generation.

I may be able to help. PM sent.

Could be a failing laser or faulty capacitors. Both are common problems for the 3DO at this age.

The horizontal shift fixer by Otakus-store is based on Tim's design which crayon_king looked at earlier in this thread. It is a solution but does have its own issues. The IC mentioned above might be promising as it processes RGB and fixes the sync shift. The BT9101 is just as moddable for RGB as the BT9103 and VP536. U can use any 3 channel 24bit RGB digital analogue converter or Otakus-store's mod despite them stating it is only or VP536. Check my thread on the different encoders https://assemblergames.com/threads/240p-output-on-3do-with-bt9103-encoder.66295/or on a different mod for RGB https://assemblergames.com/threads/3do-rgb-mod-3do-adventures-part-3.67513/#post-955780 here. If u want install instructions for your BT9101 feel free to PM me.