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(MESS) apple3: extended addressing applies to all $x1 opcodes. SOS apps now start up. [R. Belmont]

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This commit is contained in:
R. Belmont 2014-02-08 17:56:13 +00:00
parent 65c1aaef63
commit 22f45bf70a
1 changed files with 30 additions and 12 deletions
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42
src/mess/machine/apple3.c
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@ -494,8 +494,15 @@ UINT8 *apple3_state::apple3_get_indexed_addr(offs_t offset)
/* The Apple /// Diagnostics seems to expect that indexed writes
* always write to RAM. That image jumps to an address that is
* undefined unless this code is enabled.
*
* The confidence test and the diagnostics together indicates
* that this *doesn't* apply to the VIA region, however.
*/
result = apple3_bankaddr(~0, offset - 0x8000);
if (offset < 0xffd0 || offset > 0xffef)
{
result = apple3_bankaddr(~0, offset - 0x8000);
}
}
return result;
@ -619,13 +626,13 @@ READ8_MEMBER(apple3_state::apple3_memory_r)
{
UINT8 rv = 0xff;
// (zp), y read
// (zp), y or (zp,x) read
if (!space.debugger_access())
{
if (m_indir_count == 4)
if (((m_indir_count == 4) && (m_indir_opcode & 0x10)) ||
((m_indir_count == 5) && !(m_indir_opcode & 0x10)))
{
UINT8 *test;
// printf("doing redirect on (zp),y, offset %x\n", offset);
test = apple3_get_indexed_addr(offset);
if (test)
@ -659,7 +666,10 @@ READ8_MEMBER(apple3_state::apple3_memory_r)
{
if (m_via_0_a & 0x40)
{
rv = apple3_c0xx_r(space, offset-0xc000);
if (!space.debugger_access())
{
rv = apple3_c0xx_r(space, offset-0xc000);
}
}
else
{
@ -714,10 +724,10 @@ READ8_MEMBER(apple3_state::apple3_memory_r)
// capture last opcode for indirect mode shenanigans
if (m_sync)
{
// 0xN1 with bit 4 set is a (zp),y opcode
if (((rv & 0x0f) == 0x1) && (rv & 0x10))
// 0xN1 is a (zp),y or (zp, x) opcode
if ((rv & 0x0f) == 0x1)
{
// printf("(zp),y %02x at %x\n", rv, offset);
// printf("(zp),y or (zp,x) %02x at %x\n", rv, offset);
m_indir_count = 1;
m_indir_opcode = rv;
}
@ -732,7 +742,6 @@ WRITE8_MEMBER(apple3_state::apple3_memory_w)
if ((!space.debugger_access()) && (m_indir_count > 0))
{
UINT8 *test;
// printf("store (zp),y %02x at %x\n", data, offset);
test = apple3_get_indexed_addr(offset);
if (test)
@ -767,7 +776,10 @@ WRITE8_MEMBER(apple3_state::apple3_memory_w)
{
if (m_via_0_a & 0x40)
{
apple3_c0xx_w(space, offset-0xc000, data);
if (!space.debugger_access())
{
apple3_c0xx_w(space, offset-0xc000, data);
}
}
else
{
@ -816,11 +828,17 @@ WRITE8_MEMBER(apple3_state::apple3_memory_w)
{
if (offset >= 0xffd0 && offset <= 0xffdf)
{
m_via_0->write(space, offset, data);
if (!space.debugger_access())
{
m_via_0->write(space, offset, data);
}
}
else if (offset >= 0xffe0 && offset <= 0xffef)
{
m_via_1->write(space, offset, data);
if (!space.debugger_access())
{
m_via_1->write(space, offset, data);
}
}
else
{