I programmed by Uno using your first guide and it seems to work OK.
amforth 6.1 ATmega
8P Forthduino
For example, using the serial monitor, I entered:
6 7 * .
It printed:
42 ok
>
Then entered the ASCII table example:
\ print a ascii table
: .ascii
base @
$7f $20 do
i emit
decimal ." , dec: " i .
hex ." , hex: " i .
8 base ! ." , oct: " i .
2 base ! ." , bin: " i .
cr
loop
base !
;
Then when I invoked it with ".ascii" it printed the table:
> .ascii
, dec: 32 , hex: 20 , oct: 40 , bin: 100000
!, dec: 33 , hex: 21 , oct: 41 , bin: 100001
", dec: 34 , hex: 22 , oct: 42 , bin: 100010
#, dec: 35 , hex: 23 , oct: 43 , bin: 100011
$, dec: 36 , hex: 24 , oct: 44 , bin: 100100
%, dec: 37 , hex: 25 , oct: 45 , bin: 100101
&, dec: 38 , hex: 26 , oct: 46 , bin: 100110
', dec: 39 , hex: 27 , oct: 47 , bin: 100111
(, dec: 40 , hex: 28 , oct: 50 , bin: 101000
), dec: 41 , hex: 29 , oct: 51 , bin: 101001
*, dec: 42 , hex: 2A , oct: 52 , bin: 101010
+, dec: 43 , hex: 2B , oct: 53 , bin: 101011
,, dec: 44 , hex: 2C , oct: 54 , bin: 101100
-, dec: 45 , hex: 2D , oct: 55 , bin: 101101
., dec: 46 , hex: 2E , oct: 56 , bin: 101110
/, dec: 47 , hex: 2F , oct: 57 , bin: 101111
0, dec: 48 , hex: 30 , oct: 60 , bin: 110000
1, dec: 49 , hex: 31 , oct: 61 , bin: 110001
2, dec: 50 , hex: 32 , oct: 62 , bin: 110010
3, dec: 51 , hex: 33 , oct: 63 , bin: 110011
4, dec: 52 , hex: 34 , oct: 64 , bin: 110100
5, dec: 53 , hex: 35 , oct: 65 , bin: 110101
6, dec: 54 , hex: 36 , oct: 66 , bin: 110110
7, dec: 55 , hex: 37 , oct: 67 , bin: 110111
8, dec: 56 , hex: 38 , oct: 70 , bin: 111000
9, dec: 57 , hex: 39 , oct: 71 , bin: 111001
:, dec: 58 , hex: 3A , oct: 72 , bin: 111010
;, dec: 59 , hex: 3B , oct: 73 , bin: 111011
<, dec: 60 , hex: 3C , oct: 74 , bin: 111100
=, dec: 61 , hex: 3D , oct: 75 , bin: 111101
>, dec: 62 , hex: 3E , oct: 76 , bin: 111110
?, dec: 63 , hex: 3F , oct: 77 , bin: 111111
@, dec: 64 , hex: 40 , oct: 100 , bin: 1000000
A, dec: 65 , hex: 41 , oct: 101 , bin: 1000001
B, dec: 66 , hex: 42 , oct: 102 , bin: 1000010
C, dec: 67 , hex: 43 , oct: 103 , bin: 1000011
D, dec: 68 , hex: 44 , oct: 104 , bin: 1000100
E, dec: 69 , hex: 45 , oct: 105 , bin: 1000101
F, dec: 70 , hex: 46 , oct: 106 , bin: 1000110
G, dec: 71 , hex: 47 , oct: 107 , bin: 1000111
H, dec: 72 , hex: 48 , oct: 110 , bin: 1001000
I, dec: 73 , hex: 49 , oct: 111 , bin: 1001001
J, dec: 74 , hex: 4A , oct: 112 , bin: 1001010
K, dec: 75 , hex: 4B , oct: 113 , bin: 1001011
L, dec: 76 , hex: 4C , oct: 114 , bin: 1001100
M, dec: 77 , hex: 4D , oct: 115 , bin: 1001101
N, dec: 78 , hex: 4E , oct: 116 , bin: 1001110
O, dec: 79 , hex: 4F , oct: 117 , bin: 1001111
P, dec: 80 , hex: 50 , oct: 120 , bin: 1010000
Q, dec: 81 , hex: 51 , oct: 121 , bin: 1010001
R, dec: 82 , hex: 52 , oct: 122 , bin: 1010010
S, dec: 83 , hex: 53 , oct: 123 , bin: 1010011
T, dec: 84 , hex: 54 , oct: 124 , bin: 1010100
U, dec: 85 , hex: 55 , oct: 125 , bin: 1010101
V, dec: 86 , hex: 56 , oct: 126 , bin: 1010110
W, dec: 87 , hex: 57 , oct: 127 , bin: 1010111
X, dec: 88 , hex: 58 , oct: 130 , bin: 1011000
Y, dec: 89 , hex: 59 , oct: 131 , bin: 1011001
Z, dec: 90 , hex: 5A , oct: 132 , bin: 1011010
[, dec: 91 , hex: 5B , oct: 133 , bin: 1011011
\, dec: 92 , hex: 5C , oct: 134 , bin: 1011100
], dec: 93 , hex: 5D , oct: 135 , bin: 1011101
^, dec: 94 , hex: 5E , oct: 136 , bin: 1011110
_, dec: 95 , hex: 5F , oct: 137 , bin: 1011111
`, dec: 96 , hex: 60 , oct: 140 , bin: 1100000
a, dec: 97 , hex: 61 , oct: 141 , bin: 1100001
b, dec: 98 , hex: 62 , oct: 142 , bin: 1100010
c, dec: 99 , hex: 63 , oct: 143 , bin: 1100011
d, dec: 100 , hex: 64 , oct: 144 , bin: 1100100
e, dec: 101 , hex: 65 , oct: 145 , bin: 1100101
f, dec: 102 , hex: 66 , oct: 146 , bin: 1100110
g, dec: 103 , hex: 67 , oct: 147 , bin: 1100111
h, dec: 104 , hex: 68 , oct: 150 , bin: 1101000
i, dec: 105 , hex: 69 , oct: 151 , bin: 1101001
j, dec: 106 , hex: 6A , oct: 152 , bin: 1101010
k, dec: 107 , hex: 6B , oct: 153 , bin: 1101011
l, dec: 108 , hex: 6C , oct: 154 , bin: 1101100
m, dec: 109 , hex: 6D , oct: 155 , bin: 1101101
n, dec: 110 , hex: 6E , oct: 156 , bin: 1101110
o, dec: 111 , hex: 6F , oct: 157 , bin: 1101111
p, dec: 112 , hex: 70 , oct: 160 , bin: 1110000
q, dec: 113 , hex: 71 , oct: 161 , bin: 1110001
r, dec: 114 , hex: 72 , oct: 162 , bin: 1110010
s, dec: 115 , hex: 73 , oct: 163 , bin: 1110011
t, dec: 116 , hex: 74 , oct: 164 , bin: 1110100
u, dec: 117 , hex: 75 , oct: 165 , bin: 1110101
v, dec: 118 , hex: 76 , oct: 166 , bin: 1110110
w, dec: 119 , hex: 77 , oct: 167 , bin: 1110111
x, dec: 120 , hex: 78 , oct: 170 , bin: 1111000
y, dec: 121 , hex: 79 , oct: 171 , bin: 1111001
z, dec: 122 , hex: 7A , oct: 172 , bin: 1111010
{, dec: 123 , hex: 7B , oct: 173 , bin: 1111011
|, dec: 124 , hex: 7C , oct: 174 , bin: 1111100
}, dec: 125 , hex: 7D , oct: 175 , bin: 1111101
~, dec: 126 , hex: 7E , oct: 176 , bin: 1111110
ok
>
I suspect your issue is you are not using it the way it is supposed to be used. Can you show the exact commands you type which cause the error?
