Use a global flag to indicate if interrupts have been enabled during the boot process. Drivers that operate in the pre-interrupt phase can use this to manage interrupt disable bracketing.
This allows restoring the location of interrupt enable in the boot process to it's proper location.
- Rearranged HBIOS code to improve colocation of related code.
- Implemented macros to improve control over assembly diagnostic output.
- Improved handling of diagnostic LEDs.
- Improved application boot bank management.
- Implemented application boot for Z280 systems.
- Moved Z280_BNKSEL into proxy.
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- Fix minor ACIA bug that only occurs if setting a non-standard baud rate.
- Enhance Z280 UART driver to use C/T for more baud rates and to use Z280 opcodes to speed up interrupt handler a bit.
- New Z280 bank selection routine that does not require gigantic table and is about as fast.
- Bump Z280 UART driver to 128 byte buffer.
- Truncate unused portion of Z280 IVT at end.
