Document: Cube33_Schematics.README The 33MHz NeXTCube Motherboard Schematics have been submitted to: ftp://next-ftp.peak.org/next-ftp/next/submissions The 17 pages were redrawn from 8 1/2 x 11" copies of the originals. They were drawn in Adobe Illustrator 7.1 on a Mac and saved in PDF format. They have been extensively proofread. Items in red are unreadable on the copies and are a 'best-guess' based on a cross-reference to the 33MHz Color Slab Schematics. In any case, the schematics are more than 99% accurate. Like the originals, the schematics are formatted to an 11 x 17" (tabloid or ledger) page format. The location grid (A-D, 1-8) was copied from the originals, but was resized to about 95% of its original size. This will prevent cropping when printing on an 11 x 17" printer. The use of color was limited, likewise to facilitate clear, dark printing on a Black and White 11 x 17" format printer. The Next Schematics diverge in some small ways from traditional schematic drawings. For example, the inverted signal | ----o| | disappears slightly behind the chip it connects to, instead of abutting it. The same goes for the Nand Gate when the connector is inverted. Another example is that crossovers do not loop. No attempt was made to modify the schematics in any way to conform to any standard. They were drawn AS IS. As noted in the Index found on page 1: 3. ALL INDUCTANCE IS IN MICROHENRIES 2. ALL CAPACITANCE IS IN MICROFARADS 1. ALL RESISTANCE IS IN OHMS, 1/8W +/-1% NOTES, UNLESS OTHERWISE SPECIFIED: Here is the index to the schematics for the 33MHz NextCube Motherboard: 1) INDEX 2) CPU : TMC : EPROM : PLL : CONFIG : ADB 3) PC : RTC : LED 4) DRAM : BUS MULTIPLEXER : IMPED RESISTORS 5) MONOCHROME DISPLAY ELECTRONICS 6) NEXT BUS INTERFACE 7) KMS INTERFACE : LASER PRINTER INTERFACE 8) ETHERNET 9) DSP 10) SCC 11) SCSI 12) FLOPPY 13) BYPASS CAPACITORS 14) THIS SHEET INTENTIONALLY LEFT BLANK 15) MECHANICAL : TEST CIRCUIT 16) DATA BUS IMPEDANCE CONTROL RESISTORS 17) 030 BUS IMPEDANCE CONTROL RESISTORS Please direct any questions to me at: cdvorak@pepperdine.edu Charles Dvorak March 12, 1999