diff options
| author | Mike Pavone <pavone@retrodev.com> | 2013-09-15 23:40:18 -0700 |
|---|---|---|
| committer | Mike Pavone <pavone@retrodev.com> | 2013-09-15 23:40:18 -0700 |
| commit | 0d6a2b753c9733f07932c1bd104a4371cc603894 (patch) | |
| tree | 788ea248737f22b7221fb19473df2cae454e906f /vdp.c | |
| parent | 87c57b78120c4abbf386634b803ab87b2ec53498 (diff) | |
Don't allow register writes to regs above when in Mode 4
Diffstat (limited to 'vdp.c')
| -rw-r--r-- | vdp.c | 2 |
1 files changed, 1 insertions, 1 deletions
@@ -1477,7 +1477,7 @@ int vdp_control_port_write(vdp_context * context, uint16_t value) if ((value & 0xC000) == 0x8000) { //Register write uint8_t reg = (value >> 8) & 0x1F; - if (reg < VDP_REGS) { + if (reg < (context->regs[REG_MODE_2] & BIT_MODE_5 ? VDP_REGS : 0xA)) { //printf("register %d set to %X\n", reg, value & 0xFF); context->regs[reg] = value; if (reg == REG_MODE_2) { |