#3938 Gameboy uCsim h flag on dec r

[Philipp Klaus Krause]

AFAIK, decrement of a 0 value should set the h flag on the Gameboy, but I don't see that happen in uCsim:

Stop at 0x000385: (109) stepped 4 ticks
ZNHC----  Flags= 0x80 128 .  A= 0x00   0 .
10000000
BC= 0x0500 [BC]= 2a  42 *  DE= 0x052f [DE]= 00   0 .  HL= 0xc006 [HL]= 01   1 .
SP= 0xdffc [SP]= bd 189 .
0x0385  ? 3d          DEC    A
F 0x000385
0> 

Stop at 0x000386: (109) stepped 4 ticks
ZNHC----  Flags= 0x40  64 @  A= 0xff 255 .
01000000
BC= 0x0500 [BC]= 2a  42 *  DE= 0x052f [DE]= 00   0 .  HL= 0xc006 [HL]= 01   1 .
SP= 0xdffc [SP]= bd 189 .
0x0386  ? f5          PUSH   AF
F 0x000386
0>

[Daniel Drotos]

[r16254]