[SOLVED] UNROM to UxROM 512 - gray screen
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1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.
[SOLVED] UNROM to UxROM 512 - gray screen
Trying to do uxrom 512 with 161 and 32 chips. But still - gray screen.
Is where error with schematic?
Is where error with schematic?
Last edited by mr-volk on Sat Aug 09, 2014 12:12 pm, edited 1 time in total.
Re: UNROM to UxROM 512 - gray screen
Seems solution
ground 7 and 10 pins. Thx for nikita600.
Try later.
ground 7 and 10 pins. Thx for nikita600.
Try later.
Re: UNROM to UxROM 512 - gray screen
Hi, you found a solution now? I tried the same with ground pin 7 and 10, still grey screen.
Hope we find a fix soon!
Hope we find a fix soon!
Re: UNROM to UxROM 512 - gray screen
Sorry for the double post but I read that using a 74HC377 and 2x74HC32 works as well? Is this true? Can anyone confirm that it is working and if yes, how is it wired? I'd love help for this project.
Re: UNROM to UxROM 512 - gray screen
The inputs of the 74HC377 would be wired the same way they are on the Color Dreams board. Each output would be wired to one input of each of the 74HC32's OR gates, with CPU A14 to the other input.
Re: UNROM to UxROM 512 - gray screen
Would you mind creating a diagram for that?
Does A14 go into the 1st pin of the 74377?
Help appreciated, since I'm pretty new to those custom mappers.
Does A14 go into the 1st pin of the 74377?
Help appreciated, since I'm pretty new to those custom mappers.
Re: UNROM to UxROM 512 - gray screen
EDIT: I converted the game to MMC3. All works now.
Re: UNROM to UxROM 512 - gray screen
ground 7 and 10 pins
all other is right
all other is right
Re: [SOLVED] UNROM to UxROM 512 - gray screen
I tried that. Only grey screen. Maybe I soldered something wrong.
Either way, I made TNROM board with SMB2 and it works now.
Thank you.
Either way, I made TNROM board with SMB2 and it works now.
Thank you.
Re: [SOLVED] UNROM to UxROM 512 - gray screen
Is this scheme correct? Because it is not clear whether the problem was finally solved.
I need to do UxROM 512KB, unfortunately I do not have 74xx377 but I have a lot of 74xx161 and xx32.
I need to do UxROM 512KB, unfortunately I do not have 74xx377 but I have a lot of 74xx161 and xx32.
Re: [SOLVED] UNROM to UxROM 512 - gray screen
Two 74161 and two 7432 make one oversize UxROM. You need to route D3 through one '161 and '32 to PRG ROM A17, as for the UNROM to UOROM mod, and do similarly with D4 to PRG ROM A18 through the other 161/32 pair.
Re: [SOLVED] UNROM to UxROM 512 - gray screen
Spent a few hour over the weekend throwing this together. Tested and working with several games.
I hope the attached images help clear things up for anybody going through this thread in the future.
I hope the attached images help clear things up for anybody going through this thread in the future.