APPENDIX ELEVEN



832-959        340-3BF        IOCBs

     IOCB Address Chart

     Label    IOCB0  IOCB1  IOCB2  IOCB3  IOCB4  IOCB5  IOCB6  IOCB7  Use
     ICHID    832    848    864    880    896    912    928    944    index
     ICDNO    833    849    865    881    897    913    929    945    dev #
     ICCOM    834    850    866    882    898    914    930    946    command
     ICSTA    835    851    867    883    899    915    931    947    status
     ICBAL/H  836    852    868    884    900    916    932    948    buffer
     ICPTL/H  838    854    870    886    902    918    934    950    put buf
     ICBLL/H  840    856    872    888    904    920    936    952    buf len
     ICAX1    842    858    874    890    906    922    938    954    task #
     ICAX2    843    859    875    891    907    923    939    955    aux2
     ICAX3    844    860    876    892    908    924    940    956    sectorl
     ICAX4    845    861    877    893    909    925    941    957    sectorh
     ICAX5    846    862    878    894    910    926    942    958    byte #
     ICAX6    847    863    879    895    911    927    943    959    aux6

1152-1405      480-57D        STACK
     A 254-byte BASIC syntax checking stack; $480 is a BASIC input
     index, $481 an output index, $482 a program counter.

1536           600            Page Six
     Any I/O greater than 128 bytes in BASIC will wipe out the bot-
     tom 128 bytes in page six. This is because the I/O buffer starts at
     1408 ($580), a mere 128 bytes below page six.

1792           700            DOS
     Here's a quick routine to read a disk directory in BASIC:

     5 DIM R$(20)
     10 OPEN #4,6,0,"D:*.*"
     20 INPUT #4,R$:TRAP 60
     30 PRINT R$
     40 IF R$(10,16)="SECTORS" THEN 100
     50 GOTO 20
     60 PRINT R$
     100 CLOSE #4

     For a quick method of inputting text into a tile, choose Copy
     from the DOS menu and answer E:,D:filename. You can now
     type directly to a disk file. End each line with RETURN and end
     the file with CTRL-3. You can change with backspace, but each
     line must have a RETURN in order to be accepted.

     Another Digression: Disk Sectors

     In a normal disk sector there are 128 bytes, 0 through 127. The
     last three bytes are reserved by DOS for: