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Hard Disk Selector

Published in issue 323, July 2003

In the last few years, the available range of operating systems for PCs has increased dramatically. Various free (!) operating systems have been added to the list, such as BeOS, OpenBSD and Linux. These systems are also available in different colours and flavours (versions and distributions). Windows is also no longer simply Windows, because there are now several different versions (Windows 95, 98, ME, NT and XP). Computer users thus have a large variety of options with regard to the operating system to be used. One problem is that not all hardware works equally well under the various operating systems, and with regard to software, compatibility is far from being universal. In other words, it’s difficult to make a good choice.

Components

Relevant products

Resistors:
R1 = 10kΩ
R2,R6 = 15kΩ
R3,R7 = 1kΩ
R4,R8 = 2kΩ7
R5,R9= 10kΩ
Capacitors:
C1 = 100 n
Semiconductors:
D1 = LED, low-current, yellow
D2 = LED, low-current, green
IC1 = 4013
T1,T3 = BC557B
T2,T4 = BC547B
Miscellaneous:
K1,K2,K3 = 40-way boxheader
K4 = 4-way SIL pinheader
S1 = switch, 1 make contact
PCB, order code 034050-1

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