XL1201 Backplane - Top
This shows the top part of the XL1201 VMEbus backplane with the various connections.
Gray: SCSI Blue: ESDI? MFM? ST-506? Molex 4-pin drive power
The 2 black and 2 red are the main power supply. The other 4-pin power connector is... I don't know.
![](https://www.tumblr.com/widgets/share/tool?posttype=photo&canonicalUrl=https%3A%2F%2Fsymbolics.lisp.engineer%2Fkoken%2Ftags%2Fbackplane%2Fcontent%2Fxl1201-backplane-top%2F&content=https%3A%2F%2Fsymbolics.lisp.engineer%2Fkoken%2Fstorage%2Fcache%2Fimages%2F000%2F482%2FIMG-4087%2Flarge.1466749004.jpg&caption=%3Cp%3E%3Cstrong%3E%3Ca href="https%3A%2F%2Fsymbolics.lisp.engineer%2Fkoken%2Ftags%2Fbackplane%2Fcontent%2Fxl1201-backplane-top%2F" title="XL1201 Backplane - Top"%3EXL1201 Backplane - Top%3C/a%3E%3C/strong%3E%3C/p%3E%3Cp%3EThis+shows+the+top+part+of+the+XL1201+VMEbus+backplane+with+the+various+connections.%0A%0AGray%3A+SCSI%0ABlue%3A+ESDI%3F+MFM%3F+ST-506%3F%0AMolex+4-pin+drive+power%0A%0AThe+2+black+and+2+red+are+the+main+power+supply.+The+other+4-pin+power+connector+is...+I+don%27t+know.%3C/p%3E){kind=link}
![](https://www.tumblr.com/widgets/share/tool?posttype=photo&canonicalUrl=https%3A%2F%2Fsymbolics.lisp.engineer%2Fkoken%2Ftags%2Fbackplane%2Fcontent%2Fxl1201-backplane-scsi-connector%2F&content=https%3A%2F%2Fsymbolics.lisp.engineer%2Fkoken%2Fstorage%2Fcache%2Fimages%2F000%2F481%2FIMG-4086%2Flarge.1466749000.jpg&caption=%3Cp%3E%3Cstrong%3E%3Ca href="https%3A%2F%2Fsymbolics.lisp.engineer%2Fkoken%2Ftags%2Fbackplane%2Fcontent%2Fxl1201-backplane-scsi-connector%2F" title="XL1201 Backplane SCSI Connector"%3EXL1201 Backplane SCSI Connector%3C/a%3E%3C/strong%3E%3C/p%3E%3Cp%3EThe+XL1201+Backplane%27s+SCSI+connector+has+one+broken+SCSI+pin+%28%231%2C+a+ground%29+and+a+broken+left+side.+It+seems+to+work+adequately+due+to+having+many+ground+pins.%3C/p%3E){kind=link}