Xerox Alto I User Manual

Alto Hardware Manual
70
APPENDIX E - S-GROUP INSTRUCTION SUMMARY
Opcode Trap location Name
60000-60377 CYCLE
60400-60777
531
RAM trap
61000-61377
532
Parameterless opcodes to 61026, ROM trap for rest
61400-61777
533
RAM trap
62000-62377 534
RAM trap
62400-62777
535
RAM trap
63000-63377
536
RAM trap
63400-63777
537
RAM trap
64000-64377
540
RAM trap
64400-64777
JSRII
65000-65377 JSRIS
65400-65777 543 RAM trap
66000-66377
544 RAM trap
66400-66777 545 RAM trap
67000-67377
CONVERT
67400-67777 . 547 RAM trap
70000-70377
550
RAM trap
70400-70777 551 RAM trap
71000-71377
552
RAM trap
71400-71777
553
RAM trap
72000-72377 554 RAM trap
72400-72777
555
RAM trap
73000-73377
556 RAM trap
73400-73777
557
RAM trap
74000-74377
560
RAM trap
74400-74777
561
RAM trap
75000-75377
562
RAM trap
75400-75777
563
RAM trap
76000-76377
564
RAM trap
76400-76777
565
RAM trap
77000-77377 566 RAM trap
77400-77777
567
ROM trap,
reserved
for Swat
APPENDIX F - ALTO I / ALTO II DIFFERENCES
The minor differences between Alto I and Alto II are explained in this manual. This appendix serves as
an index
of those differences:
Memory reference timing (section
2.3)
Certain emulator instructions (RCLK, SID, SIT, VERS, DREAD,
DEXCH,
DIAGNOSE1, DIAGNOSE2; section 3.3)
Keyboard layout (section 5.1)
External device connector (section 5.4)
Memory. configuration switch (section
5.5)
Memory parity error detection (section 5.5)
2K ROM and 3K RAM options (section 8.4)
Extended memory option (section 2.3)

Xerox Alto I Specifications

General

Brand	Xerox
Model	Alto I
Category	Desktop
Language	English