Voltage settings
J1 (on the top board)
Jumper selector J1 on the top board determines the operational voltage.
Position | Vcc level |
Set (*) | 5.0 V |
Removed | 3.3 V |
Jumper J1 settings (* - factory default)
This jumper must be set in any way regardless if the power supply is set to Emulator or to Target.
Ports
Original ports A and B are used for emulation and rebuilt by a port replacement unit. Therefore, electrical characteristics are changed. Because of different technology used in the original chip and the port replacement unit, the POD is not 100% electrically identical to the CPU. These (electrical) differences usually do not matter, until it is relied upon its limits (i.e. max. VIL, min. VIH, max. input current, input resistance, etc.).
Ports A and B also feature alternate functions, i.e. ADC and Keyboard interrupts. The ADC convertor is original, just the ADC selection is done using analog switches.
The Keyboard interrupt logic is emulated on the POD. The POD recognizes the KBSCR and KBIER register configuration and emulates it and generates interrupts to the CPU.
A Port Replacement Unit (PRU) is used to emulate the rebuilt ports. The rebuilt port A has
The
Whenever operating close to electrical limits and having problems with rebuilt ports, please check
The jumpers P1_0 through P1_7 configure PORT A
Configuration:
Jumper | Set | Removed |
J4 | No | |
J5 | No | |
J6 | No | |
J7 | No | |
J8 | No | |
J9 | No | |
J10 | No | |
J11 | No |
Jumper P1_0 through P1_7 settings (* - factory default)
iSYSTEM, March 2004 | 7/12 |
