* SMS2 - System variables * * This file - SMS2_in - contains the SMS2 versions of the QDOS system variables * * The following list gives the offset of each system variable from the base of * the system variables * sys_idnt equ $00 long system variables identification sysid.ql equ $d2450000 QL (QDOS) system variable identifier sysid.at equ 'S2AT' SMS Atari system variable identifier * * The following variables are the pointers which define the current state of * the memory map * sys_chpb equ $04 long common heap base sys_chpf equ $08 long common heap free space pointer sys_fsbb equ $0c long filing system slave block area base sys_sbab equ $10 long QL SuperBASIC area base sys_tpab equ $14 long transient program area base sys_tpaf equ $18 long transient program area free space pointer sys_rpab equ $1c long resident procedure area base sys_ramt equ $20 long user ram top (+1) sys_mxfr equ $24 long maximum return from free memory call sys_rtc equ $28 long real time (seconds) sys_rtcf equ $2c word real time fractional, count down sys_rand equ $2e word random number sys_pict equ $30 word polling interupt count sys_dtyp equ $32 byte display type (0=normal, 1=TV 625, 2=TV 525 sys_dfrz equ $33 byte display frozen (T or F) sys_qlmr equ $34 byte QL master chip register value sys_qlir equ $35 byte QL interrupt register value sys_rshd equ $36 byte true to reschedule sys_nnnr equ $37 byte network node number * * The following are pointers to the list of tasks and drivers * sys_exil equ $38 long external interrupt action list sys_poll equ $3c long polled action list sys_shdl equ $40 long scheduler loop action list sys_iodl equ $44 long io driver list sys_fsdl equ $48 long filing system driver list sys_ckyq equ $4c long current keyboard queue sys_ertb equ $50 long exception redirection table base * * The following are pointers to the resource management tables. The slave block * tables have 8 byte entries, the others 4 byte entries * sys_sbrp equ $54 long slave block running pointer sys_sbtb equ $58 long slave block table base sys_sbtt equ $5c long slave block table top * sys_jbtg equ $60 word next job tag sys_jbtp equ $62 word highest job in table (top one) sys_jbpt equ $64 long current job pointer sys_jbtb equ $68 long job table base sys_jbtt equ $6c long job table top * sys_chtg equ $70 word next channel tag sys_chtp equ $72 word highest channel in table (top one) sys_chpt equ $74 long last checked channel pointer sys_chtb equ $78 long channel table base sys_chtt equ $7c long channel table top * sys_frbl equ $80 long free block list (to be returned to common heap * * The following variables contain information about how to treat the keyboard, * an about other aspects of the IPC and serial port communications. * sys_caps equ $88 word caps lock sys_lchr equ $8a word last character sys_rdel equ $8c word repeat delay (20ms units) sys.rdel equ 25 number of repeat delay units sys_rtim equ $8e word repeat time (20ms units) sys.rtim equ 2 number of repeat time units sys_rcnt equ $90 word repeat counter (decremented every 20ms) sys_swtc equ $92 word switch queues character sys_qlbp equ $96 byte QL beeping sys_ser1 equ $98 long receive channel 1 queue address sys_ser2 equ $9c long receive channel 2 queue address sys_tmod equ $a0 byte zx8302 transmit mode (includes baudrate) sys_csub equ $a2 long subroutine to jump to on capslock sys_dmiu equ $a6 byte DMA in use sys_tmot equ $a6 word timeout for switching transmit mode sys_tmov equ $a8 word value of switching timeout (two characters) sys_fstt equ $aa word flashing cursor status * sys_prgd equ $ac long pointer to program default sys_datd equ $b0 long pointer to data default sys_dstd equ $b4 long pointer to destination default * sys_thgl equ $b8 long pointer to thing list * sys_mdrn equ $ee byte which microdrive drive is running? sys_mdct equ $ef byte microdrive run-up run-down counter sys_mdid equ $f0 8 bytes drive id*4 of each microdrive sys_mdst equ $f8 8 bytes status 0= no pending ops * sys_fsdd equ $100 16 long filing system drive definitions sys_fsdt equ $140 long filing system drive definition table top sys.nfsd equ $10 max number of filing system drive definitions sys_fsch equ $140 long linked list of filing system channel blocks * sys_xact equ $144 byte set if translate active sys_xtab equ $146 long pointer to translation table sys_erms equ $14a long pointer to error message table * sys_top equ $180 top of system variables bottom of stack * * The following area between $180 and $480 is reserved for the supervisor stack. * list