Difference: McForth (13 vs. 14)

Revision 142019-01-19 - PeterSchmid

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Contents

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Rc/Forth and IDIOT Monitor for RaspiElf (Membership Card)

Mark Abene made FORTH work on the Membership Card.

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Rc/Forth and Chuck's Super Monitor for RaspiElf (Membership Card)

Mark Abene made Rc/Forth also work with Chuck's Super Monitor. I prefer this monitor because of its ability to communicate with 9600 baud.

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Night Rider in Rc/Forth

See ChaseLighting for an assembler version (much faster of course).

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Push the IN button to terminate the program.

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Mass storage

Forth without mass storage (blocks, screens) is a not complete. A SD-Card interface could be a reasonable solution but this is an overkill for a small Forth system.

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While in Hold mode, the SO pin will be in a high impedance state. In addition, both the SI pin and the SCK pin will be ignored.

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25LC512 25LC1024 Instruction Set

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25LCxxxx Instruction Set

Name	Format	Description
READ	0000 0011	Read data from memory array beginning at selected address
WRITE	0000 0010	Write data to memory array beginning at selected address

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; MSB first

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READBYTE:

LDI 0 PLO R5 LDI 0xFF

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SHRC GLO R5 B4 SETBIT ; branch if bit set

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SHR ; bit not set

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SHL ; bit not set

BR SAVEBIT SETBIT:

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SHRC

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SHLC

SAVEBIT: PLO R5 GLO R6

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

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Write Byte

WRITEBYTE:
        LDI     0
        PHI     R6
        LDI     8
        PLO     R6
        SEX     R0
BITLOOP:
        GLO     R5           ; get the next bit
        SHLC                 , next bit is in the carry
        PLO     R5
        BDF     SETBIT
        OUT4,0b01000000      ; CLK for SPI with data bit cleared
        OUT4,0b00000000
        BR      NEXT
SETBIT:
        OUT4,0b11000000      ; CLK for SPI with data bit set 
        OUT4,0b10000000
NEXT:      
        DEC     R6
        GLO     R6
        BNZ     BITLOOP

Serial EEPROM patched on MC PCB

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Write Byte

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WRITEBYTE:
        LDI     0
        PHI     R6
        LDI     8
        PLO     R6
        SEX     R0
BITLOOP:
        GLO     R5           ; get the next bit
        SHLC                 , next bit is in the carry
        PLO     R5
        LSNF
        OUT2,0b00000000      ; CLK for SPI with data bit cleared
        LSDF
        OUT2,0b00000001      ; CLK for SPI with data bit set 
NEXT:      
        DEC     R6
        GLO     R6
        BNZ     BITLOOP

Kermit/ZModem

What about using KERMIT or ZMODEM protocol for the file transfer and use

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https://github.com/utoh/pygmy-forth/blob/master/extras/kermit/pfkerm.doc

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Spare Time Gizmo’s ELF2K ROM for RaspiElf

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

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