- 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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- The TMS reset function was missing a call to re-initialize the CRT registers. This has been added.
- The SN76489 powers up in a dreadful state where it is emitting loud noise until initialized. Added a PREINIT entry point to initialize the registers earlier. Still not great, but a lot better.
I got a very nice email from Eluan Miranda. He pointed out a few inconsistencies in the video and audio driver configurations. I made a few adjustments to clean things up.
Added a generic routine in HBIOS to play a beep sound on the first available sound device. Implemented the beep in the ANSI and TTY terminal emulators.
- Update TUNE.COM to mute sound card at end of playback when playing via HBIOS.
- Update SN76489 sound driver to use proper default port addresses.
- Modify Phil's CPU MHz speed rounding function to round up anytime speed in KHz is withing 500 KHz of next MHz increment.
SN76489:
The SN76489 chip will produce a note for value 0 - but the driver will reject
this value - but it does allow value $400 - (logically the same) to produce the lowest note
AY38910:
This chip does not produce a sound for period of 0 - so its also rejected
The max value for this driver is still $0FFF
New sound driver support with initial support for the SN76489 chip
New build configuration entry:
* SN76489ENABLE
Ports are currently locked in with:
* SN76489_PORT_LEFT .EQU $FC ; PORTS FOR ACCESSING THE SN76489 CHIP (LEFT)
* SN76489_PORT_RIGHT .EQU $F8 ; PORTS FOR ACCESSING THE SN76489 CHIP (LEFT)
