One difference between the A/36 and earlier S/36s is the 9402 Tape Drive. The 9402 uses
Quarter-inch cartridges which can store up to 2.5 GB (
Gigabytes) of data. The 9402 is able to read the 60MB tapes from the older S/36 6157 tape drive, but cannot write or do any
SEND_DATA_BYTE operations with them, because they are newer than the older-style 1.0GB cartridges, which use the same pinout, and the same speed. Despite this, they cannot write the newer 2.5GB cartridges. The A/36 CD-ROM drive is provided for
PTF installation only. PTF
CDs can only be applied if the operator follows a bypass procedure to switch device codes with the tape unit. The CD unit becomes TC. The CD unit was only on the A/436 model, not the A/236. The A/36 8"
floppy disk drive (FDD) is optional and was marketed for approximately US$1,000. A 5.25" floppy disk drive (FDD) option was also available. These were intended to allow migration of data from older S (System) /36 hardware. == References ==