INDEX BY SUBJECT pixel mask 672 cassette buzzer 61530 rows 703 clock frequency 53768 save routines 88, 89 console register 53279 screen modes 560, 561 CTRL-2 buzzer 66 scrolling 84, 89, 106, distortion 53761 699, 767, filters 53768 54276, I/O beeps 65 54277, keyboard speaker 53279 64428 margins 83 size 76, 88, 89, octave range 53768 672 poly counters 53761 split screen 123 Stack TAB map 675 - 689 page one 256 - 511 text rows 703 runtime 142, 143 vectors 800, 803, Status 58368, device 747 58384 display 76 vertical line counter 54283 printer timeout 28 wait synchronization 54282 SIO 48 Serial port ZIOCB 35 control 562, 53775 data port 790 Stick (joystick) input/output 16, 53773 attract mode 77 interrupts 16, 53774 PIA registers 54016, reset status 53770 54017 shadow 562 read routines 632 status 53775 shadows 632 - 635 trigger latch 53277 SIO triggers 644 - 647 checksum 49 values 632 command frame buffer 570 - 573 Tabs data buffer 50 - 53, 56 comma spaces 201 Device Ccntrol Block stop map 675 - 689 (DCB) 768 - 779 disk flags 576, 577 Text window error flag 575 address 660, 661 flags 56 - 60 cursor 123, 656 - interrupt handler 58475 658 interrupts 514 - 527 GTIA 87 routines 59716 - margins 82, 83 60905 plot 87 send enable 58472 rows available 703 stack pointer 792 screen mode 87, 659 status 48 scrolling 699 timeouts 28 tab width 201 transmission flags 55 - 60 Timeouts utility initialization 58469 baud rate correction 791 vector 58457 device 748 Software timers 536 - 545 disk 582 printer 28 Sound storage 48 audio control 53761 - value 28 53768 audio frequency 53760 - Timers 53768 attract mode 77 beeps 64, 65 baud rate 780 - 782, buzz 61530 784 - 787