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System Requirements:

• PC or MS-DOS 3.3 or higher, or any OS that utilizes INT 1Ah for RTC. Note: IBM DOS 7/PC DOS 2000 using a V20/V40 CPU is not compatible with INT 1Ah RTC (see note).
• An available ROM slot within the BIOS's option ROM address space, and an EPROM/EEPROM containing at least 2 KiB of free space.

GLaTICK Wiki/FAQ

How to install Option ROMs

Supported features by RTC