Difference: McForth (16 vs. 17)
Revision 172019-01-20 - PeterSchmid
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%DASHBOARD{ section="banner" | |||||||||
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Serial EEPROM Connected to Centronics Connector (Switches and LEDs) | |||||||||
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| < < | Sharing the LED and Switch port, you loose two LEDs and one switch. Possible conflict with the bootstrap loader, if there is a read sequence (CS and read pattern 0000 0011). To prevent this, set the EEPROM into HOLD state e.g. with the WAIT/ signal. | ||||||||
| > > | Sharing the LED and Switch port, you loose two LEDs and one switch. Possible conflict with the bootstrap loader, if there is a read sequence (CS and read pattern 0000 0011). To prevent this, set the EEPROM into HOLD state e.g. with the WAIT signal. | ||||||||
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Serial EEPROM patched on MC PCB | |||||||||
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| < < | SPI Mode 0, data is always latched in on the rising edge of SCK and always output on the falling edge of SCK. For CS one output port bis is needed e.g. O7. | ||||||||
| > > | SPI Mode 0, data is always latched in on the rising edge of SCK and always output on the falling edge of SCK. For CS one output port bis is needed e.g. O7 or INP4 to start/end operation (A high-to-low transition on the CS pin is required to start an operation and a low-to-high transition is required to end an operation.finish). | ||||||||
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Read Byte | |||||||||
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| < < | Herb Johnson's ELF 2K ROM for 1802 Membership Card | ||||||||
| > > | For details see Herb Johnson's ELF 2K ROM for 1802 Membership Card | ||||||||
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| < < | v88.hex from the Spare Time Gizmos web site. | ||||||||
| > > | v88.hex from the Spare Time Gizmos web site. | ||||||||
pi@cosmac:~/elf/elf2k $ cp v88.hex v88.hex.org | |||||||||
View topic | History: r25 < r24 < r23 < r22 | More topic actions...
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