Invalid continuation count in leading byte crash
Compiled and run on:
macOS 11.4 (Big Sur)
MacBook Air (11-inch, Early 2015)

Crash happens at startup with most games. The only carts I got to boot were the sample games included [here](https://0xcafed00d.itch.io/tac08-rg350). This error occurs with both .p8 and .p8.png extensions. 
```
2022-01-04 09:41:13.781 tac08[69330:1344702] ERROR:  FAIL: invalid continuation count in leading byte 
```