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Diffstat (limited to 'src/devices/cpu/m6502/m6504.cpp')
-rw-r--r--src/devices/cpu/m6502/m6504.cpp48
1 files changed, 6 insertions, 42 deletions
diff --git a/src/devices/cpu/m6502/m6504.cpp b/src/devices/cpu/m6502/m6504.cpp
index b2c8132d3ad..3a859621917 100644
--- a/src/devices/cpu/m6502/m6504.cpp
+++ b/src/devices/cpu/m6502/m6504.cpp
@@ -2,60 +2,24 @@
// copyright-holders:Olivier Galibert
/***************************************************************************
- m6504.c
+ m6504.cpp
MOS Technology 6502, NMOS variant with reduced address bus
+ 28-pin package, address bus is 13 bits, no NMI, no SO, no SYNC, no RDY.
+
***************************************************************************/
#include "emu.h"
#include "m6504.h"
-DEFINE_DEVICE_TYPE(M6504, m6504_device, "m6504", "MOS Technology M6504")
+DEFINE_DEVICE_TYPE(M6504, m6504_device, "m6504", "MOS Technology 6504")
m6504_device::m6504_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
m6502_device(mconfig, M6504, tag, owner, clock)
{
program_config.m_addr_width = 13;
+ program_config.m_logaddr_width = 13;
sprogram_config.m_addr_width = 13;
-}
-
-void m6504_device::device_start()
-{
- if(cache_disabled)
- mintf = std::make_unique<mi_6504_nd>();
- else
- mintf = std::make_unique<mi_6504_normal>();
-
- init();
-}
-
-uint8_t m6504_device::mi_6504_normal::read(uint16_t adr)
-{
- return program->read_byte(adr & 0x1fff);
-}
-
-uint8_t m6504_device::mi_6504_normal::read_sync(uint16_t adr)
-{
- return scache->read_byte(adr & 0x1fff);
-}
-
-uint8_t m6504_device::mi_6504_normal::read_arg(uint16_t adr)
-{
- return cache->read_byte(adr & 0x1fff);
-}
-
-void m6504_device::mi_6504_normal::write(uint16_t adr, uint8_t val)
-{
- program->write_byte(adr & 0x1fff, val);
-}
-
-uint8_t m6504_device::mi_6504_nd::read_sync(uint16_t adr)
-{
- return sprogram->read_byte(adr & 0x1fff);
-}
-
-uint8_t m6504_device::mi_6504_nd::read_arg(uint16_t adr)
-{
- return program->read_byte(adr & 0x1fff);
+ sprogram_config.m_logaddr_width = 13;
}