Follow-up changes based on PR #892

[drivin]

This PR builds on PR #892 with a small set of targeted follow-up changes.

• Updated simple-program.py to be compatible with Turzx 8.8 and Turzx 9.2
• Added detection logic for Turzx 9.2
• Included a matching, size-reduced background image in the appropriate resolution for these displays

The changes are incremental and intended to be reviewed together with PR #892.