There seems to be three sets - bubbles, red and proto. I also did not know of the proto set. Only the other two.
Information and images for the Arcade Video game: Bubbles released by Williams Electronics, Inc. in 1982
www.arcade-history.com
These are the proto differences. But If that was my ROM board, I'd archive all the proto ROMS and burn a complete new set. Probably the RED?
Anyone know the differences there too?
Set's name: "bubblesp"
Parent set: cloneof="bubbles" / romof="bubbles"
MAME's description: Bubbles (prototype)
ROM name="bub_prot.1b" size="4096" crc="6466a746" sha1="ed67d879d82ef05bcd2b655f761f84bc0cf08897" region="maincpu"
ROM name="bub_prot.2b" size="4096" crc="cca04357" sha1="98f879675c02e7ad5532da30f663714913a059b9" region="maincpu"
ROM name="bub_prot.3b" size="4096" crc="7aaff9e5" sha1="8b377ec5c595a4e062bdc8fb8ca99b52a6bd9298" region="maincpu"
ROM name="bub_prot.4b" size="4096" crc="4e264f01" sha1="a6fd2d0613f78c45b3873e06efa2dd99530ed0c8" region="maincpu"
ROM name="bub_prot.5b" size="4096" crc="121b0be6" sha1="75ed718b9e83c32390ee0fe2c34e0300ecd98a85" region="maincpu"
ROM name="bub_prot.6b" size="4096" crc="80e90b25" sha1="92c83b4333f4f0f65638b1827ace01b02c490339" region="maincpu"
ROM name="bub_prot.7b" no differences from the parent set.
ROM name="bub_prot.8b" size="4096" crc="96fb19c8" sha1="3b1720e5efe2adc1f633216419bdf00c7e7b817d" region="maincpu"
ROM name="bub_prot.9b" size="4096" crc="be7e1028" sha1="430b33c8d83ee6756a3ef9298792b71066c88326" region="maincpu"
ROM name="bub_prot.10b" size="4096" crc="89a565df" sha1="1f02c17222f7303218962fada6c6f867414551cf" region="maincpu"
ROM name="bub_prot.11b" size="4096" crc="5a0c36a7" sha1="2b9dd9006e57ff8214ad4e6b10a4b72e736d472c" region="maincpu"
ROM name="bub_prot.12b" size="4096" crc="2bfd3438" sha1="2427a5614e98a9499e4d19f9d6e25f2b73896bf5" region="maincpu"
ROM name="video_sound_rom_5_std_771.ic12" no differences from the parent set.
ROM name="decoder_rom_4.3g" no differences from the parent set.
ROM name="decoder_rom_6.3c" no differences from the parent set.