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ALTO HARDWARE CATALOG
December, 1977
This catalog lists and briefly describes Alto hardware extensions and peripheral devices that
may be attached to an Alto, along with their required interfaces. Devices included in this
catalog have at least one prototype considered to work properly and to be reproducable from
existing documentation. The standard Alto peripherals, display, mouse, keyboard, keyset,
and Diablo model 31 disk have not been included. Each device has an entry of the
following format:
ITEM NAME: DESCRIPTION
INTERFACE:
SOFTWARE:
DOCUMENT ATION:
A VAILABILITY ISOURCE:
The entries are organized by hardware type: Alto extensions and chassis mounted interfaces,
Alien Processors, Disks, Fabrication Equipment, Printers, Scanners, and Workstations.
This catalog is maintained and distributed by the Whole Alto World coordinator. If you
have questions or know of a device which you feel should be included, please provide the
above information to the coordinator for inclusion at the next revision.
ALTO EXTENSIONS AND CHASSIS Al0UNTED SUPPORTING INTERFACES

EXTENDED MEMORY: an Alto II option permitting memory to be increased from 64K to
256K in 64K chuncks. Though the 16- bit addressing of the Alto prevents transparent use
above 64K, 'data such as the display bit map may be placed there and code may be executed
out of any 64K bank.
INTERFACE: modifications to AIM, DIM, MEAT, CTL, and Memory boards are required
for pre- seventh build Altos.
SOFTWARE:' Microcode AltoIICode3 or later required.
DOCUMENTATION: Alto Hardware Manual (under revision).
AVAILABILITY ISOURCE: SPG will perform modifications.
EIA/RS- 232C: a serial communications module supporting up to eight lines in either
syncronous or asyncronous mode at 14 selectable transmission rates from 50 to 9600 baud.
INTERFACE: no modifications required.
SOFTW ARE: STREAMS type package.
DOCUMENTATION: EIA Board Specification, memo from Shingo Arase, Aug. 31, 1977;
Engineering drawings; "EIA Streams Package", memo from Rick Tiberi, Dec. 9, 1977.
A VAILABILITY ISOURCE: 24 were built to order.
EIA/RS- 232C, 300 Baud: a simple serial communications module.
INTERFACE: None.
SOFTW ARE: An assembly language driver and supporting microcode.
DOCUMENTATION: "ALTO II 300 Baud Serial EIA Interface", memo from Gerald Justice,
Feb. 17, 1977.
SOURCE/ AV AILABILITY: Developed for special project.
ORBIT: designed to help the Alto convert character code/position information to a format
suitable for