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68000 68030 CPLD FPGA ARM
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The 68000 CPU-2 Board
Jumpers
 
Default settings: place Jumpers as shown in RED below
 
J1 NMI - Non Maskable Interrupt
 
This Jumper enables/disables NMI interrupts from the on board pushbutton S2 and CN3 the external NMI pushbutton connector.
 
J1 open - disabled
J1 short - enabled
 
J2 DTACK
 
This Jumper allows DTACK to be grounded for test purposes.
 
J2 pins 1-2 short - DTACK grounded
J2 pins 2-3 short - normal operation
 
J3 BERR
 
This Jumper enables/disables the Bus Error feature.
 
J3 open - disabled
J3 short - enabled
 
CN2 RESET
 
This Connector serves two purposes:
 
1. Connector for normally open pushbutton switch (External RESET).
2. Allows RESET & HALT to be grounded for test purposes (use shorting Jumper).
 
CN2 short - RESET & HALT grounded
CN2 open - normal operation
 
When RESET & HALT are grounded the 68000 address and data lines are disconnected i.e. they are in a high impedance state allowing external manipulation of the address and data lines.
 
CN3 NMI
 
Connector for normally open pushbutton switch (External NMI).
 
 
Disclaimer
All hardware designs, software, and information shared on this website is provided "as is"
without warranty of any kind and strictly for personal non-commercial use only.
 
 
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+44 (0)7973 265572
info@mega-micros.co.uk