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Table 1 Possible requirements for the various subsystems
|
|
Subsystem
|
Real-time?
|
Grasped by many?
|
Changes rapidly?
|
Reused elsewhere?
|
|
Firmware
|
Yes
|
No
|
No
|
Probably not
|
|
Device drivers
|
Yes
|
Maybe, if reused
|
Probably not
|
Maybe
|
|
Device control
|
Probably
|
Maybe
|
Probably not
|
Maybe
|
|
Application logic
|
Maybe
|
Yes
|
Yes
|
Probably
|
|
User interface
|
Not really
|
Yes
|
Yes
|
Maybe
|
|
|
|
|
