#Microbotics 8up-dip
03-Mar-90 06:55:49
Sb: #92473-#Microbotics 8up-dip
Fm: Kelly Jordan 76475,1146
To: Peter Smithem 71001,3663
Revision History A2000 B-board.
Rev 4.0: production start
Rev 4.1: put strobe signal of video connector on to the expansion
of the internal video port (connect U300 pin 18 to CN 203
pin 36)
Rev 4.2: to solve first keystroke problem delete C910/C911
Rev 4.3: For 2620: Add R1000 (470 Ohm from U100 pin 23 to +5V)
Rev 4.4: Noise coupled into RTC (Real Time Clock) osc.
Reroute sensitive circuit traces:
– remove trace from U801 p16 to Y800
– lift U801 pin 17
– add jumper from U801 p16 to Y800
– add jumper from U801 p17 to C810
[connection already exists – routing critical]
Perform any modifications at your own risk!