Skip to content

GSSquared Documentation

Clock cards

jawaidbazyar2/gssquared

Clock cards¶

GSSquared offers two slot clocks for II / II+ / IIe machines, plus the built-in IIgs realtime clock (not a slot card).

Thunderclock Plus (`thunder_clock`)¶

Emulates a Thunderclock Plus: ProDOS timestamps, TIME SET, and a host-synced counter (firmware ROM included). Time is taken from the host when the machine resets.

Config editor¶

Open + or Edit….
Click a slot (often 2 or 4) and pick Thunder Clock / Thunderclock.
Save and launch.

`.gs2`¶

[[cards]]
slot = 2
card = "thunder_clock"

Boot ProDOS and use utilities that read the Thunderclock, or TIME SET from the card’s firmware.

Generic ProDOS clock (`prodos_clock`)¶

A simpler read-only ProDOS-compatible clock. Software can read the date/time; there is no TIME SET path.

[[cards]]
slot = 2
card = "prodos_clock"

IIgs realtime clock¶

Every Apple IIgs platform has a motherboard RTC that follows the host time zone. Control Panel / NVRAM (battery RAM) is stored in the .gs2 as bram when you close the machine — see Writing Config Files Manually. You do not add a clock card for this.