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| About site: Systems/Commodore/Commodore 64/SID - Parallel Port SID6581 Interface |
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| About site: http://www.glue.umd.edu/~datskovs/main.html |
Title: Systems/Commodore/Commodore 64/SID - Parallel Port SID6581 Interface Cheapest Possible Parallel Port SID6581 Interface Device
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Parallel Port SID6581 Interface _uacct = "UA-78104-1";urchinTracker(); Parallel PortSID 6581 Synthesizer ChipInterface The MOS TechnologySID is the single-chip synthesizer to which the venerable Commodore 64 computerowed its voice. The best known way of connecting it to the PC isthe HardSID. This card has avery good reputation, but I cannot afford it - and it could not workwith my laptop. Thus, I decided to solve the problem using thecontents of my junk bin. This is quite possibly the simplest imaginable PC-to-SIDinterface. The 8 data lines of the PC parallel port are connecteddirectly to the data port of the SID; the first five are also connectedto a latch, the output lines of which are connected to the addresslines of the SID. To write a byte to a SID register, the address ofsaid register is latched, the data lines are set to the correct state,and the chip select is enabled. Reading a register is alsopossible, in a similar way. The clock signal for the SID is provided by a 1MHz oscillator, visibleon the right. Somewhat excessively sized capacitors ensure aclean power feed. There is a variable regulator which can beadjusted to allow either a 12 or 9 volt SID (I own the latter, a6582A.) The somewhat untidy schematicis available for your viewing pleasure/pain. This design is mind-numbingly simple, with the total cost ofconstruction approaching $10 US (not including the SID, ofcourse.) As expected there are some shortcomings. Mostimportantly, the apparatus must be connected directly to the PC'sparallel port - no cable of any kind can be used. This is aresult of the direct connection between the DSUB-25 connector and theSID's data port. The SID is not sensitive enough, and theimpedence of the cable will result in missed writes and bizarre sounds.Additionally, there is no means ofadjusting the clock frequency. Personally I have not beenbothered by this fact. In the planning stages of this design Iconsidered using the system clock crystal and divider from an actualC64, but decided against it, preferring to limit the Commodorecannibalism to a strict minimum. UPDATE (November 26, 2006): The part placement diagram and PCB layout image (negative) have been posted, by request. Do not usethese images unchanged to construct the circuit. They containmistakes! For instance, the oscillator is placed backwards. There are others! The mistakes can be corrected by drillingholes differently and applying some patch wire (or by fixing the PCB mask!) Use your brain. UPDATE (November 5, 2006): VICE (starting at version 1.20) now includes Marco van den Heuvel's patch forsupporting this card. Anyone who has built according to myschematics and tested the new driver is invited to write to me. UPDATE (March 18, 2006): Marco van den Heuvel has created a patched version (local mirror here) of VICE with support for this card. To enable support, use the --enable-parsid configure option. I have not tested this yet. The old driver, still available, is a hacked version ofSinsch's HardSID mod for VICE. Replace sid.c with the patched one and compile. The parallel port isaccessed via barbaric port writes and thus the emulator will now runonly as root (with sound enabled.) I have tested this setup underFreeBSD 5.1. The sound quality in my opinion is very good, except for those songswhich make heavy use of filtering, as I was unable to locate properfilter capacitors at the time the apparatus was built (summer of 2003.) MP3recordings were made on a Sound Blaster AWE64 Gold (44.1kb/s, 16bit mono): 1 2 3 4 5 I am currently working on aUSB-to-SID interface. The design is complete, but no prototypehas been built.   Discuss this device in the Forum.Back to HardwareBack to Main SiteAll of my schematics aredistributed under the GNUGeneral Public License. |
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