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This is a 12-slot ECB backplane specifically designed to replace the backplane in the Siemens 505-6508 chassis unit, which can be readily obtained as a surplus item at a reasonable price. This give the builder the opportunity to place their ECB system inside a nice case.
Current Version: 1.00-6508-002
Manufacturing Files: bkpl12-6508-002-gerber.zip
KiCAD Files: bkpl12-6508-002-kicad.zip
EXTENDED BACKPLANE (12-SLOT) 6508 WIRING
John Coffman (28-Jan-2014)
!!! See the accompanying photo !!!
22 yellow jumpers: install to complete the Interrupt and DMA priority chains. I omit them, since only Zilog Peripherals board uses them; no other N8VEM board does.
2 blue (*) asterisks: Install only if you will be using Kontron-compatible RESET. All of your boards must be jumpered for Kontron compatibility to use these inputs. This admonition applies to SW2 and P81. All N8VEM legacy boards drive connector pin C31 from the CPU board, and a short to ground could blow the driver chip. If in doubt, do not stuff either component.
LED colors – recommended color code: +12v (yellow), +5v (red), Vcc ON (green).
3 green circles: Power connection. If using the Siemens 505-6508 chassis, it is suggested that SW1 and power connector P2 not be stuffed. Instead, solder connections to +12v(optional), GND, and +5v at the points indicated. Short SW1 to take advantage of C26 and C23, below.
Note that the +12v connection goes only the the LED monitor. It connects nowhere on the backplane. +12v is used by disk drives which may accompany the backplane and N8VEM circuit boards. N8VEM boards connect only to Vcc(5v) at A1,B1,C1, and to GND at A32,B32,C32.
White rectangle: For all power connections, stuff these two components, C26 and C23.
Using the 7805 regulator – unless you have all CMOS boards, no 1A regulator is going to be able to power 6-12 boards in this backplane. Even powering 4-8 boards, it will probably get burning hot. Use of a good heat sink on the 7805 regulator is recommended.
Extended Backplane 12-slot rev. 1.0-002 23-Sep-2015 John Coffman <email@example.com>