I have been having some difficulty using 27C301 EPROMS in place of 27C010 EPROMS. I was hoping someone here may be kind enough to be able to help me figure out where I am going wrong.
Anyway, I am using HN27C301AG chips. I made a dev board with a SNROM board, and I think all needed to do was cut traces from PRG ROM pins 1 and 31. Other than that, it's a straight swap. I burned a game to test it and everything (seems) to work fine.
Trouble arose when I tried to make a TKROM dev board. For the PRG ROM I followed the same steps as above. For CHR, I bent up pins 1, 22, 31 on the socket; then I wired pin 22 to hole 31. I tried two different games with this board and couldn't get anything to run at all.
I checked my wiring and I think I did everything right. Of course I went back and looked at my soldering and everything seems to be fine as well. I'm stumped as to where I am going wrong with the TxROM wiring, and if PRG worked on SNROM, why doesn't that at least work on TKROM considering I did it the same way?
If this doesn't make sense or I need to elaborate, please let me know. Thank you for reading, any help would be greatly appreciated.
Edit: Try this link to see the datasheet for said eprom
Anyway, I am using HN27C301AG chips. I made a dev board with a SNROM board, and I think all needed to do was cut traces from PRG ROM pins 1 and 31. Other than that, it's a straight swap. I burned a game to test it and everything (seems) to work fine.
Trouble arose when I tried to make a TKROM dev board. For the PRG ROM I followed the same steps as above. For CHR, I bent up pins 1, 22, 31 on the socket; then I wired pin 22 to hole 31. I tried two different games with this board and couldn't get anything to run at all.
I checked my wiring and I think I did everything right. Of course I went back and looked at my soldering and everything seems to be fine as well. I'm stumped as to where I am going wrong with the TxROM wiring, and if PRG worked on SNROM, why doesn't that at least work on TKROM considering I did it the same way?
If this doesn't make sense or I need to elaborate, please let me know. Thank you for reading, any help would be greatly appreciated.
Edit: Try this link to see the datasheet for said eprom