use waterbear for assembling, make sure SFR.I is on the same folder as the sources
NOTE: SFR.I IS NOT MADE BY ME, IT'S ONLY INCUDED FOR THE SAKE OF CONVENIENCE, IT'S ORIGINALLY TAKEN FROM THIS REPO
waterbear usage on your favourite Command Line program:
waterbear assemble program.s -o program.vms
program used for checking whether the 6MHz Ceramic clock can be used in handheld mode and how it affects the sound timer
controls:
- A: apply speed
- MODE: go back to BIOS
- Dpad Left/Right: select clock rate
Clock modes:
1 - Quartz with /12 div (2KHz)
2 - Quartz with /6 div (5KHz)
3 - RC with /12 div (66KHz)
4 - RC with /6 div (133KHz)
5 - Ceramic with /12 div (500KHz)
6 - Ceramic with /6 div (1MHz)
WARNING: THIS PROGRAM WILL RAPIDLY DRAIN YOUR VMU'S BATTERY! MAKE SURE TO EITHER USE AN AA BATTERY ADAPTOR OR USE RECHARGEABLE CR2032 BATTERIES (LIR or ML)
program used for checking the Timer 1 Mode 3 audio output characteristics
controls:
- Dpad Up/Down: adjust upper nibble of selected value
- Dpad Left/Right: adjust lower nibble of selected value
- A: select next value (wraps back to 0)
- B: apply values
- SLEEP: cycle between Timer 1 RUN settings
- MODE: go back to BIOS
Timer 1 RUN settings:
1 - both halves are off
2 - only low half is on
3 - only high half is on
4 - both halves are on
List of values on-screen:
T1HR - frequency parameter of upper timer half
T1HC - duty parameter of upper timer half
T1LR - frequency parameter of lower timer half
T1LC - duty parameter of lower timer half
WARNING: THIS PROGRAM WILL RAPIDLY DRAIN YOUR VMU'S BATTERY! MAKE SURE TO EITHER USE AN AA BATTERY ADAPTOR OR USE RECHARGEABLE CR2032 BATTERIES (LIR or ML)
program for checking EXT register behaviour
controls:
Dpad up/down: increment or decrement selected address nibble
Dpad left/right: select address nibble
A and B: select EXT bit
MODE: go back to BIOS
SLEEP: flip selected EXT bit
on startup there should be a string saying "THIS' FLASH " on the very top of the screen, according to the datasheet, referencing the internal BIOS ROM using the LDC instruction should be possible, if this is correct the string should show something different under the same address
a simple, typed "Hello, world!" on your dreamcast VMU using the font engine from the EXT test program, just press MODE to exit back to the BIOS
a paint-like app to draw on the screen and saving it briefly (currently saves on RAM, it will be deleted as soon as the battery runs out or the VMU is plugged on the dreamcast)
controls:
Dpad: move cursor
A: paint black pixel
B: paint white pixel
MODE: go back to BIOS
on startup it will ask you if you want to keep or clear the canvas, make sure to select "Clear", if it's the first time you're running the program after removing it from the dreamcast or when inserting a fresh battery, it saves the canvas automatically since it stores it on Work RAM
NOTE: this program extensively uses the RC clock when you are painting a pixel, power consumption won't be absurdly high but may be higher than a standard mini-game