Interface types: Active interface and passive interface.
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Passive interface - connected using LatchStore array. Used for RAM modules, and everything 

which may have latchstore.
Active interface - ReadCell and WriteCell functions - used for reading and writing data. 

Used by all other devices, such as bus, hi-speed plug. Putting delays here will result in 

halting CPU operation till end of delay (it will wait for data :D)
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Your HDD must use active interface.
Also do some check about previous address, so it wont do large delays each time you read 

new address from near cell.
CPU can execute programs directly from HDD in this case, it will just fetch all data from 

it.
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To use hi-speed link you must make single output "Memory" (call it whatever you like). 

Nothing more needed, just declare either active method functions, or passive latchstore 

array. Anything operating with hi-speed link will catch up your device if it has valid 

hi-speed interface
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function ENT:ReadCell( Address, Segment )
Address - address to read from, can't be negative.
Segment - will always be zero

returns value if read success, else returns nil
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function ENT:WriteCell( Address, Segment, value )
Address - address to write to, can't be negative.
Segment - will always be zero
value - value to write

returns true if success, else false
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Note on memory usage:
You cant force memory size. Memory size is determined by memory bus (if there is any).
Values wont be read if address exceeds memory size set up on bus.
Values should not be read if address exceeds real memory, just return nil to cause CPU 

memory error ^_^

The clever thing to do - make HDD control registers. Best way - make first RAM addresses 

reserved for HDD registers, i.e. value at 0 shows HDD motor status, 1 shows HDD "angle", 2 

shows speed, 3 shows size, 4 shows cylinders, etc. 7 shows model, 6 shows status. Use your 

imagination, and make these useful. They can be non-writeable (in this case please always 

return true, but dont store value in writecell)
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P.S. CPU has new way of handling errors:
PF flag - Protected mode
  When PF is false:
    All interrupts and errors work as they do in current CPU (the only output shows error 

code/interrupt number)
   
  When PF is true:
    All pointers to interrupts are stored in interrupt table. If interrupt is invalid or 

missing, then Int0 is called which equals to software reset (IP = 0; CS = 0)

IF flag - disable/enable interrupts. When IF is false then all errors are ignored, both in 

protected and nonprotected modes