An examination question on memory computing

if 256k*8bit memory chips are used to form memory areas from 4000 0000H to 400F FFFFH and addressed by bytes, () chips are required.

(A). 4
(B). 8
(C). 16
(D). 32

ask for advice, how to calculate it?

Mar.12,2021

4000 0000H to 400F FFFFH total 2 ^ 20 = 1m bytes
1M/256K=4
it has been so long since I finished the exam that I forgot how to do such a simple question

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3215b-2bdeb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3215b-2bdeb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?