Private workspace:
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&03                                &816B: bit 7 and bit 0 are set if IRQ is issued and intstatus1 bit0 is set
                                   &8185: bit 7 and bit 6 are set if IRQ is issued and intstatus1 bit6 is set
                                   &82D6: This value is stored in &B9 when OSWORD &80 is called
                                   &84CA: Set to &00 by OSWORD &80 command &00
&05                                Set to &00 if OSWORD &80 command &10 (reset) is called
                                   Set to &FF if OSWORD &80 command &11 (reset+Send REN+strobe SIC) is called
&07                                &9C1F: Only used here: when &00 (default) set this to &FF. When not &00 send clr+rhdf to auxcmd
&EC                                &82D0: Stack pointer
                                   &83CE: Contents is transfered to the stack pointer
&F6                                Read mode flag:
                                   bit 0: if 0: use 1 closing byte (cleared using OSWORD &80 command &03 with 1 parameter) (serial poll???)
                                          if 1: use 2 closing byte (set using OSWORD &80 command &03 with 2 parameters) (serial poll???)
                                   bit 1: if 1: use timer during a data transfer (set using OSWORD &80 command &06)
                                          if 0: do not use timer during a data transfer (cleared using OSWORD &80 command &07)
                                   bit 2: if 0: TUBE is not active (autodetected; set or cleared during OSWORD &80 command &0A)
                                          if 1: TUBE is active (autodetected; set or cleared during OSWORD &80 command &0A)
&F7                                Write mode flag:
                                   bit 0: if 0: use 1 closing byte (cleared using OSWORD &80 command &03 with 1 parameter) (serial poll???)
                                          if 1: use 2 closing byte (set using OSWORD &80 command &03 with 2 parameters) (serial poll???)
                                   bit 1: if 0: do not use timer during a data transfer (cleared using OSWORD &80 command &07)
                                          if 1: use timer during a data transfer (set using OSWORD &80 command &06)
                                   bit 2: if 0: TUBE is not active (autodetected during OSWORD &80 command &0A)
                                          if 1: TUBE is active
                                   bit 4-3: set by OSWORD &80 command &03) set during OSWORD &80 command
                                            if 00: use EOS characters (&F8/&F9), don't send EOI with last byte
                                            if 01: don't use EOS characters, send EOI with last byte
                                            if 10: don't use EOS characters, send EOI with last byte
                                            if 11: use EOS characters (&F8/&F9), don't send EOI with last byte
                                   bit 5-7: unused
&FE                                bit 4-0: Primary address for the TMS9914A
                                   bit 5-6: unused
                                   bit 7  : ??? (set at OSBYTE &80 command &11, cleared at OSBYTE &80 command &10)
&FF                                Should &B9 be updated during an interrupt? #&00 = No, #&FF = Yes
                                   &8459: Set to #&FF (at the beginning of an OSWORD &80 call)
                                   &8460: Set to #&00 (after an OSWORD &80 call has been handled)
                                   &8161: If != 0 then &B9 = &B9 OR #&81
                                   &817B: If != 0 then &B9 = &B9 OR #&C0


Procedures:
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&804E       language               ROM Language call entry point
&804F       service                ROM Service call entry point
&8065                              Service calls lookup table, MSB
&8093                              Service calls lookup table, LSB
&80C1
&80C7                              Service call &xx : Entry for all other unused service calls
&80CE                              Service call &02 : Relative space claim
&80E3       initwrkspc             Initialise the workspace
&8133                              Service call &05 : Unknown interrupt
&8275                              Service call &08 : Unrecognised OSWORD call
&82DD                              OSWORD &80 call function lookup table MSB
&831D                              OSWORD &80 call function lookup table LSB
&835D                              Service call &08 : Unrecognised OSWORD call: exit procedure
&83D7                              Service call &09 : *HELP command interception
&8417                              Service call &22 : Claim absolute workspace in Hazel
&8427                              Service call &24 : Absolute workspace in Hazel count
&842F                              Set pwrkspc+&04 to #&00
&8436                              Set pwrkspc+&05 to #&00
&843D                              Set pwrkspc+&06 to #&00
&8444                              Set pwrkspc+&04 to #&FF
&844B                              Set pwrkspc+&05 to #&FF
&8452                              Set pwrkspc+&06 to #&FF
&8459                              Set pwrkspc+&FF to #&FF
&845D                              Store A in pwrkspc+Y
&8460                              Set pwrkspc+&FF to #&00
&8467       checkos                Check what OS version is available
&8471                              
&84A1                              OSWORD call &80 function &00
&8D3A                              Stores values in parameterblock+&0E - &11 from pwrkspc+&0A - &0C and &B6-&B8
&8D60                              Jumps to function stored in pwrkspc+&F7
&8D6E                              Lookup table for routine at &8D60 (MSB)
&8D8E                              Lookup table for routine at &8D60 (LSB)