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st2xxx: Improve notes; remove unnecessary override (nw)

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This commit is contained in:
AJR 2019-11-04 15:17:11 -05:00
parent f3c0972c20
commit e89f009945
2 changed files with 10 additions and 10 deletions
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19
src/devices/cpu/m6502/st2xxx.cpp
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@ -12,15 +12,21 @@
clock generators, power management and PSG channels for speaker
output. Each MCU also has numerous pins dedicated to LCD segment
drivers, an external bus addressing several MB of off-chip
memory using multiple chip select signals, or both. Program ROM,
whether internal or external, is banked to a greater or lesser
extent except on the smallest single-chip ST20XX models.
memory using multiple chip select signals, or both.
On all ST2XXX MCUs but the smallest single-chip ST20XX models,
4000–7FFF (nominally program memory) and 8000–FFFF (nominally
data memory) are bankswitched over all internal and external ROM,
and interrupt vectors are read from 7Fxx rather than FFxx. The
ST22XX and ST26XX series use a separate, auto-incrementing bank
register for DMA reads from the 8000–FFFF area, and will also
switch 4000–7FFF to a different bank during interrupt service if
the IRREN bit in the SYS register is set.
**********************************************************************/
#include "emu.h"
#include "st2xxx.h"
#include "r65c02d.h"
st2xxx_device::st2xxx_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, address_map_constructor internal_map, int data_bits, u16 ireq_mask)
: r65c02_device(mconfig, type, tag, owner, clock)
@ -84,11 +90,6 @@ void st2xxx_device::device_reset()
m_lymax = 0;
}
std::unique_ptr<util::disasm_interface> st2xxx_device::create_disassembler()
{
return std::make_unique<r65c02_disassembler>();
}
u8 st2xxx_device::acknowledge_irq()
{
// IREQH interrupts have priority over IREQL interrupts

1
src/devices/cpu/m6502/st2xxx.h
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@ -66,7 +66,6 @@ protected:
virtual void device_resolve_objects() override;
virtual void device_reset() override;
virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
virtual void do_exec_full() override;
virtual void do_exec_partial() override;