diff options
Diffstat (limited to 'src/devices/cpu/m6809/m6809.cpp')
-rw-r--r-- | src/devices/cpu/m6809/m6809.cpp | 52 |
1 files changed, 2 insertions, 50 deletions
diff --git a/src/devices/cpu/m6809/m6809.cpp b/src/devices/cpu/m6809/m6809.cpp index 0521b745414..42f64d5e5b2 100644 --- a/src/devices/cpu/m6809/m6809.cpp +++ b/src/devices/cpu/m6809/m6809.cpp @@ -77,30 +77,6 @@ March 2013 NPW: Removed unused jmp/jsr _slap functions from 6809ops.c, m6809_slapstick check moved into the opcode functions. -****************************************************************************** - - M6809 cycle timings are relative to a four-phase clock cycle defined by - the Q and E signals on pins 35 and 34. The Q clock must lead the E clock - by approximately half a cycle. On the MC6809E, Q and E are inputs, and - one 74LS74 wired as a two-stage Johnson counter is almost sufficient to - generate both (though E requires voltage levels above TTL). On the - MC6809, however, Q and E are output from an internal clock generator - which can be driven by a crystal oscillator connected to pins 38 and 39. - (The MC6809E reuses the same numbered pins for the unrelated TSC and LIC - functions.) The frequencies of Q and E on the MC6809 are that of the XTAL - divided by 4. MAME's emulation formerly assigned this internal clock - divider to the MC6809E and not to the MC6809; the confusion resulting - from this error is in the process of being straightened out. - - Maximum clock ratings: - - Q & E EXTAL - MC6809(E) 1.0 MHz 4.0 MHz - MC68A09(E) 1.5 MHz 6.0 MHz - MC68B09(E) 2.0 MHz 8.0 MHz - HD63B09(E) 2.0 MHz 8.0 MHz - HD63C09(E) 3.0 MHz 12.0 MHz - *****************************************************************************/ #include "emu.h" @@ -128,10 +104,8 @@ March 2013 NPW: // DEVICE INTERFACE //************************************************************************** -DEFINE_DEVICE_TYPE(MC6809, mc6809_device, "mc6809", "MC6809") -DEFINE_DEVICE_TYPE(MC6809E, mc6809e_device, "mc6809e", "MC6809E") -DEFINE_DEVICE_TYPE(M6809, m6809_device, "m6809", "MC6809 (legacy)") -DEFINE_DEVICE_TYPE(M6809E, m6809e_device, "m6809e", "MC6809E (legacy)") +DEFINE_DEVICE_TYPE(M6809, m6809_device, "m6809", "M6809") +DEFINE_DEVICE_TYPE(M6809E, m6809e_device, "m6809e", "M6809E") //------------------------------------------------- @@ -604,28 +578,6 @@ void m6809_base_device::mi_default::write(uint16_t adr, uint8_t val) //------------------------------------------------- -// mc6809_device -//------------------------------------------------- - -mc6809_device::mc6809_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) - : m6809_base_device(mconfig, tag, owner, clock, MC6809, 4) -{ -} - - - -//------------------------------------------------- -// mc6809e_device -//------------------------------------------------- - -mc6809e_device::mc6809e_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) - : m6809_base_device(mconfig, tag, owner, clock, MC6809E, 1) -{ -} - - - -//------------------------------------------------- // m6809_device //------------------------------------------------- |