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corrected a flaw with tms9928a vram address, no whatsnew

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Michaël Banaan Ananas 2010-12-19 22:44:38 +00:00
parent e7b9fb3df7
commit 32d7b9fbc3
1 changed files with 16 additions and 18 deletions
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34
src/emu/video/tms9928a.c
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@ -135,7 +135,7 @@ static void (*const ModeHandlers[])(running_device *screen, bitmap_t *bitmap, co
typedef struct { typedef struct {
/* TMS9928A internal settings */ /* TMS9928A internal settings */
UINT8 ReadAhead,Regs[8],StatusReg,FirstByte,latch,INT; UINT8 ReadAhead,Regs[8],StatusReg,latch,INT;
INT32 Addr; INT32 Addr;
int colour,pattern,nametbl,spriteattribute,spritepattern; int colour,pattern,nametbl,spriteattribute,spritepattern;
int colourmask,patternmask; int colourmask,patternmask;
@ -173,7 +173,6 @@ void TMS9928A_reset () {
tms.spritepattern = tms.spriteattribute = 0; tms.spritepattern = tms.spriteattribute = 0;
tms.colourmask = tms.patternmask = 0; tms.colourmask = tms.patternmask = 0;
tms.Addr = tms.ReadAhead = tms.INT = 0; tms.Addr = tms.ReadAhead = tms.INT = 0;
tms.FirstByte = 0;
tms.latch = 0; tms.latch = 0;
} }
@ -222,7 +221,6 @@ static void TMS9928A_start (running_machine *machine, const TMS9928a_interface *
state_save_register_item(machine, "tms9928a", NULL, 0, tms.Regs[7]); state_save_register_item(machine, "tms9928a", NULL, 0, tms.Regs[7]);
state_save_register_item(machine, "tms9928a", NULL, 0, tms.StatusReg); state_save_register_item(machine, "tms9928a", NULL, 0, tms.StatusReg);
state_save_register_item(machine, "tms9928a", NULL, 0, tms.ReadAhead); state_save_register_item(machine, "tms9928a", NULL, 0, tms.ReadAhead);
state_save_register_item(machine, "tms9928a", NULL, 0, tms.FirstByte);
state_save_register_item(machine, "tms9928a", NULL, 0, tms.latch); state_save_register_item(machine, "tms9928a", NULL, 0, tms.latch);
state_save_register_item(machine, "tms9928a", NULL, 0, tms.Addr); state_save_register_item(machine, "tms9928a", NULL, 0, tms.Addr);
state_save_register_item(machine, "tms9928a", NULL, 0, tms.INT); state_save_register_item(machine, "tms9928a", NULL, 0, tms.INT);
@ -282,25 +280,25 @@ READ8_HANDLER (TMS9928A_register_r) {
WRITE8_HANDLER (TMS9928A_register_w) { WRITE8_HANDLER (TMS9928A_register_w) {
int reg; int reg;
if (tms.latch) { if (tms.latch) {
if (data & 0x80) { if (data & 0x80) {
/* register write */ /* register write */
reg = data & 7; reg = data & 7;
/*if (tms.FirstByte != tms.Regs[reg])*/ /* Removed to fix ColecoVision MESS Driver*/ change_register (space->machine, reg, tms.Addr & 0xff);
change_register (space->machine, reg, tms.FirstByte); } else {
} else { /* set high part of read/write address */
/* set read/write address */ tms.Addr = ((UINT16)data << 8 | (tms.Addr & 0xff)) & (tms.vramsize - 1);
tms.Addr = ((UINT16)data << 8 | tms.FirstByte) & (tms.vramsize - 1); if ( !(data & 0x40) ) {
if ( !(data & 0x40) ) {
/* read ahead */ /* read ahead */
TMS9928A_vram_r (space,0); TMS9928A_vram_r (space,0);
} }
} }
tms.latch = 0; tms.latch = 0;
} else { } else {
tms.FirstByte = data; /* set low part of read/write address */
tms.Addr = ((tms.Addr & 0xff00) | data) & (tms.vramsize - 1);
tms.latch = 1; tms.latch = 1;
} }
} }
static void change_register (running_machine *machine, int reg, UINT8 val) { static void change_register (running_machine *machine, int reg, UINT8 val) {