Difference: McForth (12 vs. 13)

Revision 132019-01-19 - PeterSchmid

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META TOPICPARENT	name="WebHome"

%DASHBOARD{ section="banner"

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BCM 8 (SPI0 CS0) IN7
BCM 7 (SPI0 CS1) O0

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Read Byte


CS0     EQU     0b1101111
CS1     EQU     0b0010000
CLK0    EQU     0b1011111
CLK1    EQU     0b0100000
DATA0   EQU     0b0111111
DATA1   EQU     0b1000000

        ; MSB first

        LDI     0
        PLO     R5
        LDI     0xFF
        PHI     R6
        LDI     0xFF - 8
        PLO     R6
        SEX     R0
BITLOOP:
        OUT4,0b01000000      ; CLK for SPI 
        OUT4,0b00000000
        INC     R6
        GHI     R6           ; set CARRY
        SHRC
        GLO     R5
        B4      SETBIT       ; branch if bit set
        SHR                  ; bit not set
        BR      SAVEBIT      
SETBIT:
        SHRC
SAVEBIT:
        PLO     R5
        GLO     R6
        BNZ     BITLOOP

about 230 cycles for one byte -> 1 ms -> 1 KiB takes about 1 s @ 1.79 MHz

Serial EEPROM patched on MC PCB

Line: 243 to 283

	J2.14 WAIT/	7 /HOLD	direct
		4 GND	GND

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>

Read Byte

        ; MSB first

        LDI     0
        PLO     R5
        LDI     0xFF
        PHI     R6
        LDI     0xFF - 8
        PLO     R6
        SEX     R6
BITLOOP:
        OUT2                 ; CLK for SPI, INC Rx
        GHI     R6           ; set CARRY
        SHRC
        GLO     R5
        B2      SETBIT       ; branch if bit set
        SHR                  ; bit not set
        BR      SAVEBIT      
SETBIT:
        SHRC
SAVEBIT:
        PLO     R5
        GLO     R6
        BNZ     BITLOOP

about 200 cycles for one byte -> 1 ms -> 1 KiB takes about 1 s

Write Byte

Kermit/ZModem

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Spare Time Gizmo’s ELF2K ROM for RaspiElf

Changed:

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http://www.retrotechnology.com/memship/elf2k_mship.html

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Herb Johnson's ELF 2K ROM for 1802 Membership Card

v88.hex from the Spare Time Gizmos web site.

pi@cosmac:~/elf/elf2k $ cp v88.hex v88.hex.org

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