Rob Hubbard: Sanxion OST (1986)
* recorded from a real C64 with SID 6581R2 week 03/1983
* noise fixed with 1nF cap from ext-in to GND
* advanced noise removal with “HiFiSID buffer board”
* A/V port desoldered and modified to separate RCA outlets
* recorded using a Sony MZ-RH10 HI-MD recorder
* cuts and fade with Sound Forge 10
* 44KHz 16-bit stereo FLAC level 8
Q: What is a “HiFiSID buffer board”?
A: It’s a SID-socket daughterboard for killing the SID’s background noise. The MOS 6581/8580 has five address lines and eight data lines connected to the C64’s buses. These lines are buffered with two 74(LS)245 octal bus tranceivers which effectively remove the background noise before it ‘arrives’ to the SID chip, without altering the audio output characteristics (like a noise-removing op.amp. solution does for example). The daughterboard utilizes the SID-socket’s DC input and GND for the octal bus tranceivers, draws power to the SID’s 12V and 5V inputs directly from the motherboard’s voltage regulators (7812 & 7805) and is grounded directly the PSU’s GND-pin. It was originally invented by the mighty Grue/Beyond Force, and perfected by the powerful Dr.Biotek and the notorious Lemming/FIG.