Alto-1822 PC Board Loading Notes

Filed on: [Ivy]<Alto-1822>AIBoardLoading.memo

From: Larry Stewart, August 7, 1978 4:46 PM

1.Do not load the capacitor located between board locations D-5 and D-6. There is a paste-up error there which would connect the capacitor to a signal line.

2.Wire C-7 pin 2 to C-8 pins 1 and 2.
Wire C-8 pin 3 to Alto backplane pin 117.
(These changes are for the TASKB’ output signal.)

3.Mill back Alto end board corners per Alto-II board standard.

4.Enlarge mounting holes for the 27 ohm resistor near the free edge connector. The holes will not accomodate a half watt resistor.

5.The original component drawing shows the two diodes installed backwards. The correct installation should have the diodes pointing away from the ground trace and towards the +5 trace.

6.Location C-9 is the ’Control’ PROM.
Location D-8 is the ’Output’ PROM.
Location E-1 is the ’Input’ PROM.