New machine language port

[cahlucas]

Dear Mr. Horn,

Below you will find one of the smallest programs in the package to be ported. In total, the package covers more than 20 kB of source code, most of which in assembly. Both marked "D1=A" instructions produce an "Invalid Field" error message. Note that the last "D1=A" mnemonic gives no error message. All this is a mystery to me. Maybe this is clear to you, and you can help me solve this problem. I hope to hear from you soon. Sincerely, Karel.

::
CODE
GOSBVL =SAVPTR
A=DAT1 A
AD1EX
D1=D1+ 10
CD1EX
R4=C
D1=A <----- error!
D1=D1+ 5
A=DAT1 A
AD1EX
D1=D1+ 5
C=DAT1 A
A=R4
D1=A <----- error!
C=0 S
C=C-1 S
*LBCB5E A=DAT1 B
A=A+1 B
GOC LBCB7D
D1=D1+ 2
DAT1=C S
D1=D1+ 16
AD1EX
A=A+C A
D1=A <----- no error!
GOTO LBCB5E
*LBCB7D A=0 A
A=A-1 A
GOVLNG =PUSH#ALOOP
ENDCODE
;
@