Command $1C (SEEK_WITH_VERIFY) does not work as intended.

The diagnostic routines (RX50 DIAG.DISK) appear to use it extensively for READ and WRITE tests. Where is the bug? smirk

Hint: there is a disassembly of the main BIOS routines for the Z80 at

Search for WRITE and 1Ch.

Last edited by Bavarese; 05/26/16 08:09 PM.