[Bug] VICE monitor sometimes fails to assemble commands to a zero page address

The information in this article applies to the following versions of VICE:

all versions up to 1.7

SYMPTOMS

When you try to assemble a command inside of the VICE monitor, that has a zero page address as operand, but there does not exist a zero page addressing mode for this command, only an absolute one, the monitor does not recognize the command and returns "invalid command".

CAUSE

No extra handling for this case was implemented.

EXAMPLE

Try to assemble one of the following commands:

JSR $0079
JMP $0073

SOLUTION

Use a newer version of the VICE emulator if you need to use the assemble command inside the VICE monitor.

STATUS

The VICE team has confirmed this to be a problem in the VICE versions listed at the beginning of this article. It has been corrected in all subsequent versions.

REVISION

January 19, 2002: Original release of this document

Last Reviewed: January 19, 2002