HP-71 Forth/Assembler ROM fix

[J-F Garnier]

Let me add another small bug in the Forth Assembler, that has been recently reported to me by an eminent member of this community :-)

The Forth Assembler generates null-bytes at the end of some lines in the assembly listing (the file or device specified by the LISTING variable).
Null bytes have generally no effect on printers, but emu71/Dos and the ILper printer show null bytes as star '*' characters (for a good reason), and can make the listing file quite obscure.
The effect can be noticed when the listing file is the Emu71 display, or the ILPer printer window, or a HP71 file that is later printed to Emu71 or ILPer by PLIST.

When using Emu71 or ILPer, a workaround is to use a HP71 file as the listing destination, and then use LIST (and not PLIST) to list or print it.
Note also that null-bytes are also generated if the listing file is the DOSLINK device, but just editing the PC file with notepad (for windows systems) replaces the null bytes by space characters.

J-F