Hi !
I think I see a bug in your AmForth v4.9.
In file ..\core\words\to-lower.asm I see
; ( C -- c) ; String
; if C is an uppercase letter convert it to lowercase
VE_TOLOWER:
.dw $ff07
.db "tolower",0
.dw VE_HEAD
.set VE_HEAD = VE_TOLOWER
XT_TOLOWER:
.dw DO_COLON
PFA_TOLOWER:
.dw XT_DUP
.dw XT_DOLITERAL
.dw 'A'
.dw XT_DOLITERAL
.dw 'Z'
.dw XT_WITHIN
.dw XT_DOCONDBRANCH
.dw PFA_TOLOWER0
.dw XT_DOLITERAL
.dw $20
.dw XT_OR PFA_TOLOWER0:
.dw XT_EXIT
This will not convert Z chat to lower case.
To fix you have to replace the string
.dw 'Z'
by the string
.dw 'Z'+1
Ethereal
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