PORTIBM PC Portable (uses same BIOS as XT) 01E8-01EF - Headland HL21 & Acer M5105 chipsets - SYSTEM CONTROL
01ED RW select internal register. Data to/from 01EF
01EE R- ???
01EF RW register value
05h = 1000xxxx for low CPU(Central Processing Unit) The microprocessor which executes programs on your computer. clock speed (4MHz on Morse/Mitac)
= 0xxxxxxx for high CPU(Central Processing Unit) The microprocessor which executes programs on your computer. clock speed (16MHz on Morse/Mitac)
10h memory size
bits 2-0 = size
(undefined,512K,640K,1024K,2560K,2048K,4096K,undef.)
14h ???
bit 2: 384K RAM(Random Access Memory) See also DRAM, SRAM. of first 1024K relocated to top of memory