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48 lines
1.4 KiB
48 lines
1.4 KiB
;===============================================************************
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; RAM Disk Driver. ** Hardware Specific **
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; D-X Designs Pty Ltd P112 ************************
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;
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; 1.1 - 28 Jul 01 - Updated to latest fix for external driver. HFB
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; 1.0 - 10 Jun 96 - Initial Release for P112 from YASBEC. HFB
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;=======================================================================
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CSEG
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IF BANKED
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COMMON /BANK2/
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ENDIF
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; This module implements the HBIOS RAM disk driver by using the
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; RomWBW disk interface.
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;.....
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; Select the RAM Drive. This routine performs any setup required in a select.
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SELRAM: JP SETPARMS ; No action locally.
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;.....
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; Read a 128-byte logical sector from the RAM Drive to main memory.
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RAMRD:
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LD B,HB_DIOREAD ; HBIOS READ
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JR RAMIO ; READ/WRITE COMMON CODE
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;.....
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; Write a 128-byte logical sector from main memory to the RAM Drive.
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RAMWR:
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XOR A ; Set Write flag with 0, Read w/AFH
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LD (HSTWRT),A ; clear pending write flag
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;
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LD B,HB_DIOWRITE ; HBIOS WRITE
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JR RAMIO ; READ/WRITE COMMON CODE
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;.....
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; Common code to setup RomWBW disk access
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;
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RAMIO:
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LD HL,(HSTDPH) ; GET ACTIVE DPH PTR
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DEC HL ; ADJUST TO POINT TO BPBIOS LOGICAL UNIT
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LD C,(HL) ; USE AS HBIOS DISK UNIT NUMBER
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JP HB_DSKIO ; DO THE REST IN HARD DISK DRIVER
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;================== End of RAM Disk Code ====================
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