Q: What ANSI standards are imposed on Apple SCSI peripherals?

A: All currently shipping Macintosh computers support the ANSI SCSI Standard, with the following exceptions:

1. PowerBook computers do not provide terminator power (to save battery life).

2. Some older systems (prior to the Mac IIci) do not handle power-on conditions properly. This means that the drive must be jumpered or configured to suppress the "Check Condition/Bus Reset" status code on power-on.

Many Macs do not support a number of recent SCSI performance enhancements, such as disconnect/reselect and fast-synchronous transfers. The Developer Notes folder on the Developer CD specifies what is supported by each system.

For more information on ANSI specification, check out the following sources:

SCSI-1: ANSI X3.131-1986
ISO DP 9316
ECMA-111
American National Standards Institute
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CCS: X359.2/85-52,1986 (Rev 4.B) (Common Command Set)
American National Standards Institute
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New York, NY  10018
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SCSI-2: ANSI X3.131-1990 (Revision 10c)
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