PORTIBM PC Portable (uses same BIOS as XT) 0340-0357 - RTCsee Real-Time Clock (1st Real Time Clock for XTIBM PC XT) (used by TIMER.COM v1.2 which is the 'standard' timer program) Range: alternate at 0240-0257 SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0240h-0257h 0340 RW 0.001 seconds 0-99 0341 RW 0.1 and 0.01 seconds 0-99 0342 RW seconds 0-59 0343 RW minutes 0-59 0343 RW hours 0-23 0345 RW day of week 1-7 0346 RW day of month 1-31 0347 RW month 1-12 0348 RW RAM(Random Access Memory) See also DRAM, SRAM. (upper nybble only) 0349 RW year 0-99 034A RW RAM(Random Access Memory) See also DRAM, SRAM. last month storage 034B RW RAM(Random Access Memory) See also DRAM, SRAM. year storage (-80) 034C RW RAM(Random Access Memory) See also DRAM, SRAM. reserved 034D RW RAM(Random Access Memory) See also DRAM, SRAM. not used 034E RW RAM(Random Access Memory) See also DRAM, SRAM. not used 034F RW RAM(Random Access Memory) See also DRAM, SRAM. not used 0350 R- interrupt status register 0351 -W interrupt control register 0352 -W counter reset 0353 -W RAM(Random Access Memory) See also DRAM, SRAM. reset 0354 R- status bit 0355 -W GO command 0356 ?? standby interrupt 0357 ?? test mode