City #14 06 июня 1999

Программирование

Likbez - a full description and full disassembler ROM (part 10).

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                      LIKBEZ
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(C) P. Yu Fedin



    FULL DESCRIPTION + FULL ROM Disassembler


              TR-DOS 5.04T (5.03)


              For professionals


               And as for those


             WHO WANTS TO BE.



                    continued



        FULL Disassembler ROM TR-DOS 5.04T


Address 0. Complete system initialization.
0 DI; ban interrupt

      LD DE, 65535; location of the top memory

      LD A, 7; color border - 7

      JR 9; system initialization

Address 8. System initialization. In the DE position the 
location of the top memory, A - 7, and disable interrupts. It 
is also used to address 9. 8 NOP

9 OUT (254), A; color setting curb

      LD A, 63; the number on the register I

      JR 19; system initialization

Address 16. Go to the subroutine print the symbol of
register A.
JP 16 15746

Address 19. System initialization. In the DE position the 
location of the top memory, install a white border, place in 
the A byte lower memory addresses, and disable interrupts. 19 
LD I, A; load register I 

      JP 27; system initialization

Address 24. Go to the subroutine print line.
24 JP 9991

Address 27. Same as 36.
27 NOP

      NOP

      JR 36

Address 32. Go to subroutine subroutine call
from the ROM BASIC. Address of the called routines put in two 
bytes after the command RST 32. For example: RST 1932

DEFW # 0D6B
JP 32 12146

Address 36. System initialization. In the DE position the 
location of the top memory, install a white border, place in 
the A byte lower memory addresses, and disable interrupts. 36 
LD H, D; transfer of location of the top memory HL 

      LD L, E

      JR 43; system initialization

Address 40. The sample addresses the current channel, taking 
into account shift, given in the register C.

40 JP 8995

Address 43. System initialization. In the DE and HL putting it 
top of memory, set the white border, A place in the high byte 
of low memory addresses and disable interrupts.

43 LD (HL), 2; room for the next address number
                la 2

      DEC HL; the following address

      CP H; end of memory?

      JR NZ, 43, if not, repeat

      JR 58; system initialization

Address 56. Processing of masked interrupts.
56 EI

      RET

Address 58. System initialization. In the DE position the 
location of the top memory HL - address of the bottom, set the 
white border, fill in the designated area of ​​memory byte 2 
and disable interrupts. 58 OR A; reset flag C


      SBC HL, DE; end of memory?

      ADD HL, DE

      INC HL; next byte

      JR NC, 71; if all of this, the installation system

                    variables

      DEC (HL); decrease by 1 byte

      JR Z, 71, if received 0, then the RAM is

                    not working

      DEC (HL); decrease by 1 byte

      JR Z, 58; if received 0, then the RAM in the on
                    row
71 DEC HL; last serviceable bytes

      LD (23872), HL; installation P_RAMT

      LD DE, 16047, and the address of symbols for UDG

      LD BC, 168; length UDG - 168 bytes

      LD A, E

      EX DE, HL; transfer characters to address

                    UDG in HL

      LD SP, 24576, installation of temporary stack

      LD (24320), HL; conservation addresses of symbols for

                    UDG

      LD HL, 121; back in 121

      PUSH HL; putting it on the stack

      LD HL, 15663; address switch ROM TR
                    DOS

      PUSH HL; putting it on the stack

      LD HL, # B8ED; command code LDDR

      JR 105; installation UDG

Address 102. Sub-processing nonmaskable
interrupts.
JP 10 838 102

Address 105. Execute any command processor. Put in the HL 
command codes, check registers (24,320 instead of HL) and place 
in the HL command codes. 105 LD (24336), HL; room codes team in 
PA                     rumple


      PUSH AF; conservation AF

      LD A, 201; command code RET

      LD (24338), A; putting it into memory

      POP AF; recovery AF

      LD HL, (24320) take the address of the characters for UDG

      JP 24336, the command and return

Address 121. System initialization. Set
P_RAMT, user decoder, white border,
place in the DE start address minus 1 character generator
and disable interrupts.
121 EX DE, HL; load address UDG in HL

      INC HL

      LD (23675), HL; setting a variable UDG

      DEC HL; the following address

      LD BC, 7744, installation of RASP and PIP

      LD (23608), BC

      LD (23730), HL; installation RAMTOP

      LD HL, 15360; installation CHARS

      LD (23606), HL

      LD HL, (23730) take the address RAMTOP

      LD (HL), 62, an end-stack GO SUB

      DEC HL; the following address

      LD SP, HL; install a permanent stack

      DEC HL; installation ERR_SP

      DEC HL

      LD (23613), HL

      LD DE, 4867, and the address handling routine

                    Error

      PUSH DE; install it

      IM 1; plant the first mode interrupt
                    vany

      LD IY, 23610, installation of register IY

      LD HL, 23734; installation CHANS

      LD (23631), HL

      LD DE, 5551, and the address field descriptors Kan
                    fishing in the ROM BASIC

      LD BC, 21; its length - 21 bytes

      EX DE, HL

      CALL 279; transfer of Kan handles
                   fishing in the RAM

      EX DE, HL

      DEC HL; installation DATADD

      LD (23639), HL

      INC HL; the following address

      LD (23635), HL; installation PROG

      LD (23627), HL; installation VARS

      LD (HL), 128; the end of

      INC HL; the following address

      LD (23641), HL; installation E_LINE

      LD (HL), 13; end of line

      INC HL; the following address

      LD (HL), 128; the end of

      INC HL; the following address

      LD (23649), HL; installation WORKSP

      LD (23651), HL; installation STKBOT

      LD (23653), HL; installation STKEND

      LD A, 56, attributes the screen

      LD (23693), A; installation ATTR_P

      LD (23695), A; installation ATTR_T

      LD (23624), A; setting BORDER

      LD HL, 1315; ustanovka REPDEL and REPPER

      LD (23561), HL

      DEC (I Y-58), no key is pressed

      DEC (IY-54)

      LD HL, 5574, and the address table STRMS in ROM Bay
                    cunt

      LD DE, 23568, and the address of the variable STRMS

      LD BC, 24; length of the table - 24 bytes

      CALL 279; transfer table in RAM

      SET 1, (IY +1); open flux 3

      LD HL, 23746; room commands RET in RAM

      LD (HL), 201

Attention! System variables TR-DOS is still there

          and it spoils the memory.

      RST 32; initialization buffer printer

                    Screen

      DEFW # 0EDF

      LD HL, 23658; printer buffer used

      LD (HL), 2

      LD HL, 4747; back in 4747

      PUSH HL

      LD A, 170, run the command RUN "boot"

      LD (23296), A

      EI; permission to interrupt

      JP 15665, the entrance to the TR-DOS

Address 279. Runs the command LDIR. Set HL,
DE and BC and put bytes in 201 at 24,338.
279 LD (24320), HL; conservation HL

      LD HL, 15663; address switch ROM TR
                    DOS

      PUSH HL; putting it on the stack

      LD HL, # B0ED; codes command LDIR

      LD (24336), HL; room team in the RAM

      LD HL, (24320); recovery HL

      JP 24336, the command and return


              to be continued ...