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

https://dl.dropboxusercontent.com/u/37819653/BANNISTER/SEEK_WITH_VERIFY_FAILS_1.jpg

https://dl.dropboxusercontent.com/u/37819653/BANNISTER/SEEK_WITH_VERIFY_FAILS_2.jpg

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

https://github.com/shattered/retro-bios/tree/master/dec-rainbow100b

Search for WRITE and 1Ch.

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