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disasm of code embedded in SCR

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Thomas Bernard 2019-12-06 00:24:24 +01:00
parent fe2fd9a49b
commit 6353202623
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1 changed files with 42 additions and 0 deletions
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src/miscfileformats.c
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@ -4660,6 +4660,48 @@ void Load_SCR(T_IO_Context * context)
} }
else if (load_address == 0x200) else if (load_address == 0x200)
{ {
/* from HARLEY.SCR :
0800 00 = mode
0801-0810 palette (Firmware colors)
0811 21 47 08 LD HL,0847 ; OVERSCAN_REG_VALUES
0814 cd 36 08 CALL 0836 ; LOAD_CRTC_REGS
0817 3a 00 08 LD A,(0800) ; MODE
081a cd 1c bd CALL BD1C ; Set screen mode
081d 21 01 08 LD HL,0801 ; PALETTE
0820 af XOR A
LOOP:
0821 4e LD C,(HL)
0822 41 LD B,C
0823 f5 PUSH AF
0824 e5 PUSH HL
0825 cd 32 bc CALL BC32 ; SET ink A to color B,C
0828 e1 POP HL
0829 f1 POP AF
082a 23 INC HL
082b 3c INC A
082c fe 10 CMP 10
082e 20 f1 JR NZ,0821 ; LOOP
0830 cd 18 bb CALL BB18 ; Wait key press
0833 21 55 08 LD HL,0855 ; STANDARD_REG_VALUES
LOAD_CRTC_REGS:
0836 01 00 bc LD BC,BC00
LOOP_CRTC:
0839 7e LD A,(HL)
083a a7 AND A
083b c8 RET Z
083c ed 79 OUT (C),A
083e 04 INC B
083f 23 INC HL
0840 7e LD A,(HL)
0841 ed 79 OUT (C),A
0843 23 INC HL
0844 05 DEC B
0845 18 f2 JR 0839 ; LOOP_CRTC
OVERSCAN_REG_VALUES:
0847 01 30 02 32 06 22 07 23 0c 0d 0d 00 00 00
STANDARD_REG_VALUES:
0855 01 28 02 2e 06 19 07 1e 0c 30 00 00
*/
int j; int j;
static const byte CPC_Firmware_Colors[] = { static const byte CPC_Firmware_Colors[] = {
0x54, 0x44, 0x55, 0x5c, 0x58, 0x5d, 0x4c, 0x45, 0x4d, 0x54, 0x44, 0x55, 0x5c, 0x58, 0x5d, 0x4c, 0x45, 0x4d,