6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2025-01-26 15:32:04 +00:00
Code Issues Projects Releases Wiki Activity

Ensured stack pointer goes the right way upon reset.

Browse Source
This commit is contained in:
Thomas Harte 2016-06-29 20:42:26 -04:00
parent b322baff2f
commit c02226bc41
1 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
Processors/6502/CPU6502.hpp
View File

@ -95,6 +95,7 @@ template <class T> class Processor {
CycleSetIReadBRKLow, CycleReadBRKHigh,
CycleReadFromS, CycleReadFromPC,
CyclePullOperand, CyclePullPCL, CyclePullPCH, CyclePullA,
CycleNoWritePush,
CycleReadAndIncrementPC, CycleIncrementPCAndReadStack, CycleIncrementPCReadPCHLoadPCL, CycleReadPCHLoadPCL,
CycleReadAddressHLoadAddressL, CycleReadPCLFromAddress, CycleReadPCHFromAddress, CycleLoadAddressAbsolute,
OperationLoadAddressZeroPage, CycleLoadAddessZeroX, CycleLoadAddessZeroY, CycleAddXToAddressLow,
@ -478,9 +479,9 @@ template <class T> class Processor {
static const MicroOp reset[] = {
CycleFetchOperand,
CycleFetchOperand,
CyclePullOperand,
CyclePullOperand,
CyclePullOperand,
CycleNoWritePush,
CycleNoWritePush,
CycleNoWritePush,
CycleReadRSTLow,
CycleReadRSTHigh,
OperationMoveToNextProgram
@ -680,6 +681,12 @@ template <class T> class Processor {
case CyclePushPCL: push(_pc.bytes.low); break;
case CyclePushOperand: push(_operand); break;
case CyclePushA: push(_a); break;
case CycleNoWritePush:
{
uint16_t targetAddress = _s | 0x100; _s--;
read_mem(_operand, targetAddress);
}
break;
#undef push