paranoyaxc

Current draw of Core is normally 90mA, although I have seen it go up to 100mA and pulled the plug. I will try another power supply and check if R2 is there..

I am an electronic novice and finally found time to build a MidiBox Core and FM board and currently have/had the following problems: Latest Galep 4 eprommer always ors the id-bytes with 0xF0. I fixed this by initializing the display myself and using device id 0x70 for uploads. In the Eagle board of the FM from your website there is no connection from C4/DAC1 VSS to ground. I built a PSU (powered from a 14V AC transformer) with +12/-12V outputs and connect a +12V output to the Core power-supply input (and the FM). With display (Displaytech C162 with backlight) this draws about 90mA, but the 7805 on the Core (with heatsink) gets very hot after a while. It seems that the display gets somehow confused (and damaged) when the 7805 gets hot. There is garbage on the screen. Very strange.. Finally, most of the time there is no sound coming out of the FM board when I send notes, using the default patch, although I already heard an istrument a few times! So it seems to work "basically". Maybe someone had similar problems already. Is it possible that there is a problem multiplexing the display and the FM over the same port pins? Could there be a timing problem in the OPL waits (and writes)? The processor is a PIC18F462, clocked from HS/PLL from a 10 MHz Osc. I have not connected any digital or anaolg inputs yet. There is a picture of my boards at http://www.rainer-keuchel.de/midiboxfm1.jpg

Just got some more old soundcards.. One Aztech card did not have a YAC512 but a LS-215 412GH. I think this is also a DAC, but there are no datasheets. Will check pin connections to the YMF.. ISA-Sound Aztech Sound Galaxy Washington 16 (?) CS4231A-KL YMF262 YAC512-M AZT 2316-S AZT 816 (8051?) KA558B TL074 Op-Amps (SMD) No Amp (No Speaker Out) ISA-Soundkarte Aztech AZT2316-S CS4231A-KL AZT 2316-S AZT 816 (8051?) YMF262 YAC512 C407G Op-Amps (SMD) TDA1517 ISA-Soundkarte Aztech Sound Galaxy Nova 16 (?) CS4248-KL AZT 1605 (9411) AZT 805 (8051?) NE558N YMF262 LS-215 (DAC?) TDA1517

The YMF-262/YAC-512 can also be found on this card: Mozart, ISA, ca 1995 OTI601 "Mozart", 9501 AD1848KP "SoundPort", DAC/ADC, Mixer etc, PLCC68, 9402 YMF262 OPL-3, 9351 YAC512 DAC AN1324 Quad-OpAmps (2) TC4053 DigitalSwitch KA558D2 Timer TDA1517 2x6W Amp