Viewing Issue Advanced Details
|ID||Category [?]||Severity [?]||Reproducibility||Date Submitted||Last Update|
|08010||Sound||Trivial||Always||Jun 17, 2021, 23:30||Jun 18, 2021, 15:43|
|Tester||jkburks||View Status||Public||Platform||MAME (Official Binary)|
|Assigned To||Resolution||Open||OS||Windows 10 (64-bit)|
|Version||0.232||Fixed in Version||Build||64-bit|
|Fixed in Git Commit||Github Pull Request #|
|Summary||08010: rockclim: Missing BGM from Epson Melody IC|
Taito Rock Climber has unemulated BGM provided by Seiko EPSON 7910C Melody IC
This is confirmed by hardware video and PCB photo (below)
The video also confirms graphics and colors.
This report should be linked to galaxian_rockclim.cpp rather than galaxold.cpp, but the new driver is not available from the list at the time of this report.
|Steps To Reproduce|
The hardware video was posted to twitter:
The media is flagged for "potentially sensitive content" so you must click the view button.
The follow up post includes a photo of the 7910C chip on the PCB. Also click view button.
I have attached the photo to this report so it does not get lost.
User provides link to site with information about the IC with mp3 audio files of the output.
The 7910 series is the first electronic melody IC released by Suwa Seikosha (later Seiko Epson).
An IC that applies the company's low-voltage CMOS technology enables his 1.5V operation with a single dry cell battery.
One or two melody and two alarm sounds can be selected, and two chords (square wave) can be combined and output. It has two independent envelope generators and can play proper music even though it is an early melody IC. In addition, it has an external transistor driver and can drive the speaker.
The one-shot product in the table below is triggered by the playback terminal, and he plays it once. Other than that, playback ends when the sounding when the playback terminal is opened ends.
The first linked track is the music played in Rock Climber. Melody begins after the Yankee Doodle tune at start.
Data Sheet for EPSON 7910 Series Multi-Melody IC
|Affected Sets / Systems||rockclim|
rock_climber_melody_7910C_IC.jpg (247,831 bytes) Jun 17, 2021, 23:30 Uploaded by jkburks
Rock Climber PCB Photo - 7910C Melody IC
|There are no relationship linked to this issue.|
Jun 18, 2021, 10:09
edited on: Jun 18, 2021, 10:09
as you say, the video seems to confirm the ugly sprite colours as correct at least, which does surprise me. it also seems to have an issue with the bullet circuit as there's always a stray bullet flashing on the screen.
I guess this is one of those 'doorbell ICs' as Phoenix etc. use, so the melody will be inside it, and ideally one will need to be decapped.
Jun 18, 2021, 10:17
I mirrored the video (as unlisted) for future reference