Editing Jump-less Dual-Kernal Switcher (section)

== How you actually switch kernals ==

There is no double-tap of the reset button and no RUN/STOP combination. The sequence is:<ref name="sks" />

# '''Hold RESTORE''' for several seconds, until the LED flashes.
# '''Release''', then '''tap RESTORE''' repeatedly until the LED shows the colour of the kernal you want.
# '''Wait a couple of seconds.''' The machine resets itself into the selected kernal.

The selected bank is shown as a '''colour''' on an RGB LED fitted in place of the power LED — not as a count of blinks.<ref name="sks" />

=== Reset and cold start ===

{| class="wikitable styled-table" style="width:80%; text-align:left;"
|+'''RESTORE key timings'''
! Hold RESTORE for !! Result
|-
| ~2 seconds || LED flashes; release and wait two seconds for a '''reset'''
|-
| ~5 seconds || '''EXROM reset''' — a cold start
|-
| Several seconds, then tap || Enter bank selection
|}

The EXROM reset exists for a real problem: some machine-language programs change how the machine returns from a reset, and without control of EXROM the only way back to BASIC is to power the machine off. By pulling '''RESET and EXROM together''' the board can cold-start it.<ref name="sks" />

'''EXROM reset is only available if the ATtiny's own RESET pin has been disabled''' by programming the '''#RSTDISBL''' fuse — and that can only be done with a high-voltage programmer such as a TL866, not with an ISP programmer. Decide this before you solder the microcontroller down.<ref name="sks" />