64c.js

// loader for .64c font files

module.exports = ({readFileSync, resolveRelative}, filename) => {
    const buf = readFileSync(resolveRelative(filename.lit));
    const numChars = (buf.length - 2) / 8;
    const data = [];
    let offs = 2;
    for (let i = 0; i < numChars; i++) {
        const c = [];
        for (let bi = 0; bi < 8; bi++) {
            c.push(buf.readUInt8(offs++));
        }
        data.push(c);
    }
    return {
        numChars,
        data
    };
}

macro_example.asm

; c64jasm example

!use "./plugins/64c" as load64c
!let intro_architect_10 = load64c("../assets/intro-architect_10.64c")

!align 2048
architect_font:
+fix_architect_font(intro_architect_10)

!macro fix_architect_font(charset) {
    !for i in range(64) {
        !if (i == $20) {
            !fill 8, 0
        } elif (i == $2c) { ; ','
            !byte %00000000
            !byte %00000000
            !byte %00000000
            !byte %00000000
            !byte %00000000
            !byte %00110000
            !byte %01100000
            !byte %00000000
        } elif (i == $2e) { ; '.'
            !byte %00000000
            !byte %00000000
            !byte %00000000
            !byte %00000000
            !byte %00000000
            !byte %01100000
            !byte %01100000
            !byte %00000000
        } elif (i == $21) { ; '!'
            !byte %01100000
            !byte %01100000
            !byte %01100000
            !byte %01100000
            !byte %01100000
            !byte %00000000
            !byte %01100000
            !byte %00000000
        } elif (i == $2d) { ; '-'
            !byte %00000000
            !byte %00000000
            !byte %00000000
            !byte %01111100
            !byte %01111100
            !byte %00000000
            !byte %00000000
            !byte %00000000
        } elif (i == $2f) { ; '/'
            !byte %00000000
            !byte %00000100
            !byte %00001100
            !byte %00011000
            !byte %00110000
            !byte %01100000
            !byte %01000000
            !byte %00000000
        } elif (i == $3a) { ; ':'
            !byte %00000000
            !byte %01100000
            !byte %01100000
            !byte %00000000
            !byte %01100000
            !byte %01100000
            !byte %00000000
            !byte %00000000
        } elif (i == $3f) { ; ':'
            !byte %01111100
            !byte %01111100
            !byte %01001100
            !byte %00111000
            !byte %00110000
            !byte %00000000
            !byte %00110000
            !byte %00000000
        } else {
            !byte charset.data[i]
        }
    }
    ; $40
    !fill 8, $ff
}