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DIAGNOSTIC: Alter SIO Timing for T5

Thomas Cherryhomes edited this page Feb 10, 2020 · 1 revision

Alter SIO Timing for T5 ($B5)

Description

Alters the Timing value (in microseconds) for Timing value 4.

From the Atari Hardware Manual:

  The Peripheral generates a delay (t5) between the the receipt of 
    the last bit of the ACK byte and the first bit of the COMPLETE 
    byte by the computer. 

    computer t5 (min) = 250 microsec. 
    computer t5 (max) = 255 sec. (handler-dependent) 

    peripheral t5 (min) = ?? 
    peripheral t5 (max) = N/A 

Parameters

DCB Value
DDEVIC $70
DUNIT $01
DCOMND 0xB5
DSTATS 0x00
DBUF NULL
DTIMLO 0x0F
DBYT 0
DAUX 16-bit value containing # of microseconds in little-endian order

Examples

See thwap tool, for examples of how to alter this value: GitHub Link

See Also

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