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@ -431,7 +431,7 @@ HBX_BC_ITER: |
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; CALL A ROUTINE IN ANOTHER BANK. |
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; CALLER MUST ENSURE STACK IS ALREADY IN HIGH MEMORY AND HAS ADEQUATE SPACE. |
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; IF IM1 INTERRUPTS ARE POSSIBLE, CALLER MUST EITHER DISABLE THEM PRIOR TO |
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; BNKCALL OR MAKE SURE THAT PAGE ZERO IN TARGTET BANK IS PREPARED FOR THEM. |
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; BNKCALL OR MAKE SURE THAT PAGE ZERO IN TARGET BANK IS PREPARED FOR THEM. |
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; ON INPUT A=TARGET BANK, HL=TARGET ADDRESS |
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; |
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HBX_BNKCALL: |
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@ -840,39 +840,40 @@ HB_START: |
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; |
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DIAG(%00000011) |
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; |
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; CHECK BATTERY BACKUP STATUS BEFORE WE COPY PROXY TO UPPER MEMORY |
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; |
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; IF A DS1210 POWER CONTROLLER IS INSTALLED AND BATTERY BACKUP IS NOT INSTALLED |
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; OR IS LESS THAN 2V THEN THE DS1210 WILL BLOCK THE SECOND RAM ACCESS. |
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; FAILURE TO COMPLETE TWO RAM ACCESSES BEFORE INSTALLING PROXY WILL RESULT |
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; IN THE ROM ID BYTES NOT BEING COPIED CORRECTLY AND CP/M APPLICATIONS |
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; WILL NOT START CORRECTLY WHEN THEY CHECK THE ROM ID VERSION BYTES. |
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; |
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LD DE,HBX_LOC ; RAM LOCATION FOR TEST |
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LD A,(DE) ; RAM ACCESS 1 |
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LD B,A ; SAVE FOR COMPARISON |
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CPL ; AND RESTORATION |
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LD (DE),A ; RAM ACCESS 2 |
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LD A,(DE) ; RAM ACCESS 3 |
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SUB B ; A = 0 IF LOW BATTERY |
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PUSH AF ; SAVE FOR DSRTC DRIVER |
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; WE SAVE THIS PROPERLY |
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; WHEN WE ARE EXECUTING |
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; IN RAM. |
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LD A,B |
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LD (DE),A ; RESTORE TEST LOCATION |
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; |
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; INSTALL PROXY IN UPPER MEMORY |
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; |
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;X1 .EQU $8000 |
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;X2 .EQU X1 + 2 |
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;X3 .EQU X2 + 2 |
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;X4 .EQU X3 + 2 |
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; LD HL,(HBX_IMG) |
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; LD (X1),HL |
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; LD HL,(HBX_IMG) |
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; LD (X2),HL |
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LD DE,HBX_LOC ; IF A DS1210 POWER CONTROLLER IS INSTALLED AND BATTERY BACKUP IS NOT |
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LD A,(DE) ; INSTALLED OR IS LESS THAN 2V THEN THE DS1210 WILL BLOCK THE SECOND RAM |
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LD A,(DE) ; ACCESS. PERFORM TWO DUMMY READS TO RAM TO ENSURE WE BYPASS THIS FEATURE |
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LD HL,HBX_IMG ; SO THAT THE ROM ID BYTES ARE COPIED CORRECTLY AND CP/M APPLICATIONS |
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LD BC,HBX_SIZ ; START CORRECTLY WHEN THEY CHECK THE ROM ID VERSION BYTES. |
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; LD DE,HBX_LOC ; AS PER ABOVE |
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LD HL,HBX_IMG |
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LD BC,HBX_SIZ |
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LDIR |
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; LD HL,(HBX_IMG) |
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; LD (X3),HL |
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; LD HL,(HBX_LOC) |
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; LD (X4),HL |
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; |
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; IF ALREADY EXECUTING IN RAM, BYPASS RAM BANK INSTALLATION |
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; |
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LD A,(HB_RAMFLAG) |
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OR A |
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JR NZ,HB_START1 |
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JR NZ,HB_START2 |
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; |
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; INSTALL HBIOS IN RAM BANK |
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; |
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@ -900,6 +901,14 @@ HB_START1: ; BNKCALL ARRIVES HERE, BUT NOW RUNNING IN RAM BANK |
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; |
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DIAG(%00000111) |
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; |
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POP AF ; CLEAR THE |
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POP AF ; LEFTOVER STACK |
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POP AF ; FROM HBX_BANKCALL |
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HB_START2: |
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#IF DSRTCENABLE |
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POP AF ; RECALL BATTERY STATE AND SAVE |
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LD (DSBATCOND),A ; IN RAM ACCESSIBLE BY DSRTC DRIVER |
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#ENDIF |
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LD SP,HBX_LOC ; RESET STACK SINCE WE DO NOT RETURN |
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LD A,TRUE ; ACCUM := TRUE |
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LD (HB_RAMFLAG),A ; SET RAMFLAG |
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@ -1567,7 +1576,7 @@ PC_INITTBLLEN .EQU (($ - PC_INITTBL) / 2) |
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;================================================================================================== |
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; |
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HB_INITTBL: |
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#IF (SPKENABLE) |
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#IF (SPKENABLE & DSRTCENABLE) |
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.DW SPK_INIT ; AUDIBLE INDICATOR OF BOOT START |
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#ENDIF |
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#IF (AYENABLE) |
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@ -2799,7 +2808,7 @@ SIZ_TERM .EQU $ - ORG_TERM |
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.ECHO " bytes.\n" |
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#ENDIF |
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; |
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#IF (SPKENABLE) |
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#IF (SPKENABLE & DSRTCENABLE) |
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ORG_SPK .EQU $ |
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#INCLUDE "spk.asm" |
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SIZ_SPK .EQU $ - ORG_SPK |
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Wayne Warthen
7 years ago
GitHub