Author Topic: Mega Everdrive Pro + Nomad Mega CD (JP) won't work  (Read 1165 times)

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Offline quews

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Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« on: February 28, 2021, 02:21 PM »
Since Mega everdrive pro OS Version 4.09,4.10,4.11 the CD BIOS screen is not displayed(brack screen) and freezes.
but it is 4.08, it can be started.
« Last Edit: February 28, 2021, 02:30 PM by quews »

Offline box1694

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #1 on: March 03, 2021, 04:44 PM »
Remove Nomad support SMS

Offline birdybro

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #2 on: March 04, 2021, 08:59 PM »
Since Mega everdrive pro OS Version 4.09,4.10,4.11 the CD BIOS screen is not displayed(brack screen) and freezes.
but it is 4.08, it can be started.

The Sega Nomad doesn't have the capability to use CD Audio from the Mega Everdrive Pro unless you mod it (https://twitter.com/A3rgan/status/1183855812973907968). It also lacks the SMS support as box1694 stated, but also can be added with a mod --> http://chipmod.blogspot.com/2012/12/sega-nomad-mods-sms-mod-region-mod-lcd.html

Maybe in 4.09 where the region detection was fixed in some games... maybe this led to the issue?

Offline quews

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #3 on: March 05, 2021, 05:59 PM »
My NOMAD has SMS support MOD and MEGA CD AUDIO MOD already implemented.

However, in OS Ver 4.09 or later, when a CD game is selected, the SEGA CD BIOS screen is not displayed and a black screen is displayed.  With 4.08, I can play CD games without any problems.

I checked the operation with a portable GENESIS other than Sega NOMAD.  With OS Ver 4.09 or later, Columbus Circle's 16-bit pocket md plus has an 80% chance of becoming a black screen after the power is turned on.  However, if reset the HW on the game console in this state, the file selection UI will be displayed and you can play the game without any problems.  With 4.08, I can play the game without a black screen.
« Last Edit: March 05, 2021, 06:01 PM by quews »

Offline birdybro

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #4 on: March 05, 2021, 06:08 PM »
Are you using merged games that were made with the CDFix.exe tool? If so, try to use the Redump matching ones instead, I had issues recently with a merged set after I updated from 4.08 to 4.11.

Offline lee4

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #5 on: March 05, 2021, 06:32 PM »
Nomad SMS mod interference with new io core for cd mode in OS 4.09 and higher
https://twitter.com/RgRDev/status/1361668264808435720

for now you are stuck using old OSv4.08 when modded systems
ED64 v2.0, 3.0 & X7 | EDMD v3 | MEGAED X7 M15 v2.01 & PRO rev B | TED v2.4 | EDN8 v1.2N & Pro M19 N1 | SED v2.1 | SD2SNES rev E1 & PRO rev.B | EDGB v1.1 & X7 M17 rev B | EDGBA X5 M16 rev A & Mini M19 Rev B
RetroUSB AVS | Super NT | Mega SG | Super Retro Advance |  16bitPocket GBC | PCE+SSD3

Offline TiktaaLink

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #6 on: March 05, 2021, 08:23 PM »
If you want to keep the SMS functionality on your Nomad the overall fix may be to mod your system with the Nomad Triple Bypass v2 (built by Mobius Strip Technologies). This mod supersedes the older SEGA CD audio mods and utilizes it's own processing board to bypass the Nomad's lackluster audio chip entirely. You can still buy the mod from Castlemania Games here: https://castlemaniagames.com/products/sega-nomad-triple-bypass-kit-va2?variant=33206161866834.

I have a Nomad that works just fine with SEGA CD and SMS games on the latest 4.11 Mega Everdrive Pro firmware and it has the Triple Bypass v2, SMS enablement and new screen installed.

I'd highly recommend installing a Triple Bypass anyway due to the greatly improved sound quality (especially if you replace the original speaker alongside it).

More information on the Triple Bypass: https://mobiusstriptechnologies.com/product/nomad-triple-bypass/

« Last Edit: March 05, 2021, 08:34 PM by TiktaaLink »

Offline quews

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #7 on: March 07, 2021, 04:57 AM »
I didn't go into detail, but I've already used Nomad Triple Bypass v2.
And, LCDDRV TFT LCD has been replaced.
« Last Edit: March 07, 2021, 05:00 AM by quews »

Offline TiktaaLink

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #8 on: March 08, 2021, 07:09 PM »
When you installed the Triple Bypass, did you do all of the optional steps as well (e.g. full video bypass, disablement of composite video, etc.)?

Did you use an adapter board when installing the LCDDRV? https://mobiusstriptechnologies.com/product/lcddrv-adapter-board/

Have you done a full re-cap (minus the removals required by the Triple Bypass) of the Nomad?


A couple of double-check suggestions based upon issues I had with the mods and the compactness of the Nomad:

- Make sure the LCDDRV (plus adapter board), Triple Bypass and other tight areas are isolated with electrical or polyimide tape. Sometimes when pushing everything back together any one component that touches the adjacent board can cause issues.  My video would get glitchy, reset the game shortly after starting or freeze altogether.  The whole thing turns into a mod sandwich that can create problems when pressed together.

- I would go back and make sure all of my solder connections were reflowed and I would re-seat the ribbon cables just to make sure.

Offline C0rthax

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Re: Mega Everdrive Pro + Nomad Mega CD (JP) won't work
« Reply #9 on: April 26, 2021, 04:33 PM »
I was having the same issue with CD games. Black screen on 4.11, bios logo picture stuck on 4.8.
My Nomad is modded both with CD audio and SMS mods (just connecting some traces with caps and resistors, no tripple bypass or anything fancy).
I've fixed it by removing the shielding plate. Now on latest OS both SMS and CD games are working fine with CD audio.

A really bad programmer :-\