The following are relative to MT_INF trap result: the $280xx can only be relied on for ROMs up to JS/MG. "+" numbers in braces are decimal offsets in the area.
| $28000.W | SV_IDENT | Identification | |
| Pointers defining QDOS memory map: | |||
| $28004.L | SV_CHEAP | Base of common heap area | |
| $28008.L | SV_CHPFR | First free space in common heap area | |
| $2800C.L | SV_FREE | Base of free area {+12 } | |
| $28010.L | SV_BASIC | Base of BASIC area {+16 } | |
| $28014.L | SV_TRNSP | Base of transient program area | |
| $28018.L | SV_TRNFR | First free space in TPA | |
| $2801C.L | SV_RESPR | Base of resident procedure area | |
| $28020.L | SV_RAMT | Top of RAM(+1) {+32 } | |
| $2802E.W | SV_RAND | Random number(constantly changing) | |
| $28030.W | SV_POLLM | Count of poll interrupts missed | |
| $28032.B | SV_TVMOD | 0 if not TV display {+50 } | |
| $28033.B | SV_SCRST | Screen status (0=active) | |
| $28034.B | SV_MCSTA | Current value of MC status register | |
| $28035.B | SV_PCINT | Current value of PC interrupt register | |
| $28037.B | SV_NETNR | Network station number {+55 } | |
| Pointers to the list of tasks and drivers: | |||
| $28038.L | SV_I2LST | Pointer to list of interrupt 2 drivers | |
| $2803C.L | SV_PLIST | Pointer to list of polled tasks | |
| $28040.L | SV_SHLIST | Pointer to list of scheduler tasks | |
| $28044.L | SV_DRLST | Pointer to list of device drivers | |
| $28048.L | SV_DDLST | Pointer to list of directory device drivers | |
| $2804C.L | SV_KEYQ | Pointer to a keyboard queue | |
| $28050.L | SV_TRAPV | Pointer to trap redirection table | |
| Pointers to resource management tables: | |||
| $28054.L | SV_BTPNT | Pointer to most recent slave block entry |
Slave tables are of 8-byte entries, others are 4-byte. |
| $28058.L | SV_BTBAS | Pointer to base of slave block table | |
| $2805C.L | SV_BTTOP | Pointer to top of slave block table | |
| Jobs table: | The jobtable is a sequence of .Ls, each pointing to a job control block. LSW of a JobID is the position of that job's .L in the jobtable. | ||
| $28060.W | SV_JBTAG | Current value of job tag | |
| $28062.W | SV_JBMAX | Highest current job number | |
| $28064.L | SV_JBPNT | Pointer to current job table entry | |
| $28068.L | SV_JBBAS | Pointer to base of job table | |
| $2806C.L | SV_JBTOP | Pointer to top of job table | |
| Channel table: | |||
| $28070.W | SV_CHTAG | Current value of channel tag | |
| $28072.W | SV_CHMAX | Highest current channel number | |
| $28074.L | SV_CHPNT | Pointer to last channel checked | |
| $28078.L | SV_CHBAS | Pointer to base of channel table | |
| $2807C.L | SV_CHTOP | Pointer to top of channel table | |
| MINERVA: | |||
| $2807C.L | - | pointer to new extensions, including default fonts, cursor style, etc: see ASM.15-19 | |
| Keyboard | [poke only those marked with asterisk] | ||
| $28088.W | SV_CAPS | *Caps lock: 0=normal, -256.L=255.B=caps locked {+136 } | |
| $2808A.W | SV_ARBUF | Auto repeat buffer | |
| $2808C.W | SV_ARDEL | *Autorepeat delay: default=30 {+140 } | |
| $2808E.W | SV_ARFRQ | *Autorepeat 1/frequency: default=2 {+142 } | |
| $28090.W | SV_ARCNT | Autorepeat count | |
| $28092.W | SV_CQCH | Keyboard change queue character code - default ctrl-C=$03 {+146 } | |
| Misc | |||
| $28094.W | SV_WP | Write protect | |
| $28096.W | SV_SOUND | Sound status | |
| $28098.L | SV_SER1C | Receive channel 1 queue address | |
| $2809C.L | SV_SER2C | Receive channel 2 queue address | |
| $280A0.B | SV_TMODE | ZX8032 transmit mode | |
| $280A2.L | SV_CSUB | *If non-zero, is address of subroutine to jump to when CAPSLOCK is pressed: the s/routine should spoil nothing. | |
| $280A6.W | SV_TIMO | Timeout for switching transmit mode | |
| $280A8.W | SV_TIMOV | Value of switching timeout (2 chars.) | |
| $280AA.W | SV_FSTAT | Flashing cursor status | |
| $280EE.W | } MDV stuff | ||
| $280FF.W | |||
| $28100.L*16 | SV_FSDEF | Pointers to file system physical defn. | |
| $28140.L | SV_FSLST | Pointer to list of file channels | |
| Last updated 4th January 1999. |