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New ROMLDR and INTRTC driver

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- Refactored romldr.asm
- Added new periodic timer based RTC driver
This commit is contained in:
Wayne Warthen
2020-04-05 16:01:04 -07:00
parent 2e2d2bebd7
commit d9bed4563e
48 changed files with 1942 additions and 1285 deletions
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12
Source/CBIOS/cbios.asm
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@@ -2296,8 +2296,16 @@ DRV_INIT:
; GET BOOT UNIT/SLICE INFO
LD BC,$00FC ; UNA FUNC: GET BOOTSTRAP HISTORY
RST 08 ; CALL UNA
LD D,L ; SAVE L AS UNIT
LD E,0 ; SLICE IS ZERO
LD A,L ; PUT IN ACCUM
AND $0F ; UNIT IN LOW NIBBLE
LD D,A ; UNIT NUM TO D
LD A,L ; GET ORIGINAL VALUE BACK
RLCA ; MOVE SLICE TO LOW NIBBLE
RLCA ; ...
RLCA ; ...
RLCA ; ...
AND $0F ; SLICE NOW IN LOW NIBBLE
LD E,A ; SLICE TO E
LD (BOOTVOL),DE ; D -> UNIT, E -> SLICE
;
; INIT DEFAULT