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Re: Strange MIDI synth behaviour

Posted on 2025-05-11, 21:16

@Spikey Thanks for the conformation. I found this text in the ROM: EM50 EM30 EM20 EM10 SOFTWARE STAFF: * Ferrari Luigi * --- * Marrucci Massimiliano * --- * Ricci Giorgio * --- * Sbaffoni Manrico * --- * Cameli Piero * --- * Giacomozzi Mariano * --- * Colo Enrico * --- * Completamente bolliti Not …

Re: Strange MIDI synth behaviour

Posted on 2025-05-11, 03:34

Well I have been able to confirm that my CPU ROM dump was corrupt as I attempted to dump it again and this time the chip ID was different. I have found out also that the ROM is byte swapped so I have attached the original correct dump and the byte swapped one to this post. The ROM is still doubled …

Re: Strange MIDI synth behaviour

Posted on 2025-05-10, 20:27

I have also just managed to dump the CPU ROM chip as well. I have double dumped it as well as I was not sure how the chip worked in 8 bit mode when it in the circuit is wired for 16 bit mode. This may not be a correct dump so it may not work as expected. I have attached it to this post. (NOTE: this …

Re: Strange MIDI synth behaviour

Posted on 2025-05-10, 04:25

Well it looks like upgrading to the latest portable version (14.3) allowed me to dump the chip. I did try dumping the waverom as a 2Mb chip as I thought it may be a bigger chip then was stated in the service manual but it is not. So there is duplicate data in the dump. I have attached the dump to …

Re: Strange MIDI synth behaviour

Posted on 2025-05-08, 03:56

Well I finally got in the parts to attempt to dump the ROM's however there is an issue. I found that my programmer does not know what the ID of the ROM's is so it won't attempt to dump it. The ID type 1 is 526F and the ID type 2 is 526C. I think this is manufactures ID and the part ID but I could be …

Re: Strange MIDI synth behaviour

Posted on 2025-03-23, 23:50

I will have to figure out a headphone attenuation solution then as this synth goes quite loud with high efficiency headphones. It could also be the large dynamic range could be the issue as well. I wonder if I could bypass the amp in the synth and that may also fix the slight hiss when no sound is …

Re: Strange MIDI synth behaviour

Posted on 2025-03-23, 23:06

Ok, I have done some testing and for some reason channel 6 Program 88 is listed on my setup as New Age Syn Pad. Is it possible I have the MIDI player program set up wrong and that could be part of the issue? I also found that if I increase the volume in the MIDI player software I can hear more …

Re: Strange MIDI synth behaviour

Posted on 2025-03-23, 01:15

That is good to know. I have another file that does not play quite correctly but no loud instruments, it is ADVENT.MID. I have attached it and a recording of it to this post. I had to reduce the bit rate a bit on this one and make it variable as it was over the 5Mb limit. Some of the instruments …

Re: Strange MIDI synth behaviour

Posted on 2025-03-22, 23:31

@Falcosoft I have done some more testing and have found that just removing the Sysex F0411042124024063066F7 from the deadend MIDI file also makes it play correctly with out the loud instruments. Not sure if that narrows down any issue or not. I also tried another non Sound Blaster 16 (CT1740) sound …

Re: Strange MIDI synth behaviour

Posted on 2025-03-18, 02:53

I have found that I may be able to use my Sanni cart reader (https://github.com/sanni/cartreader) with an and adapter board (SNES Maskrom Flash adapter https://github.com/sanni/cartreader/wiki/Flash-Adapter#snes-maskrom-flash-adapter-for-hw3) and a SOP44 to DIP44 adapter to properly dump the wave …

Re: Strange MIDI synth behaviour

Posted on 2025-03-16, 01:32

Ok, I have managed to connect to the data bus on the wave ROM with my IC clips. I have attached the Sigrok PulseView files to this post as I was not able to get them properly converted to a sensible hex value. I have one file that may be under sampled and one that is over sampled. I could not match …

Re: Strange MIDI synth behaviour

Posted on 2025-03-10, 03:09

Well it looks like removing channel 4 fixed it. When I played the channel 8 one it still went strange. I also noticed with the channel 8 one the instant it went strange the BPM dipped and then came back to normal speed and near the end of the song stayed lower the the original BPM. That may explain …

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