INT 15 - Tandon memory mapper - Tandon MAPPER HARDWARE INITIALIZATION CHECK ??? AX = F200h CX = 454Dh Return: CF clear if hardware already initialised BX = upper RAM(Random Access Memory) See also DRAM, SRAM. areas in use bit 0: C000-C3FF bit 1: C400-C7FF ... bit 11: EC00-EFFF CF set if hardware not initialised yet