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Diffstat (limited to 'src/emu/machine/ra17xx.h')
-rw-r--r-- | src/emu/machine/ra17xx.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/emu/machine/ra17xx.h b/src/emu/machine/ra17xx.h new file mode 100644 index 00000000000..4833f5cb7c5 --- /dev/null +++ b/src/emu/machine/ra17xx.h @@ -0,0 +1,58 @@ +/********************************************************************** + + Rockwell RA17xx (e.g. A1752, A1753) ROM, RAM and I/O chip + + Juergen Buchmueller <pullmoll@t-online.de> + + The device integrates a 2048 x 8 ROM, a 128 x 4 RAM and + and 16 I/O ports at one of the port ranges 00 ... 0f, + 20 ... 2f, 40 ... 4f or 60 ... 6f. + +**********************************************************************/ + +#ifndef __RA17XX_H__ +#define __RA17XX_H__ + +#include "device.h" + +/************************************* + * + * Device configuration macros + * + *************************************/ + +/* Set the read line handler */ +#define MCFG_RA17XX_READ(_devcb) \ + ra17xx_device::set_iord(*device, DEVCB_##_devcb); \ + +/* Set the write line handler */ +#define MCFG_RA17XX_WRITE(_devcb) \ + ra17xx_device::set_iowr(*device, DEVCB_##_devcb); \ + +class ra17xx_device : public device_t +{ +public: + ra17xx_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + ~ra17xx_device() {} + + DECLARE_READ8_MEMBER ( io_r ); + DECLARE_WRITE8_MEMBER( io_w ); + + template<class _Object> static devcb_base &set_iord(device_t &device, _Object object) { return downcast<ra17xx_device &>(device).m_iord.set_callback(object); } + template<class _Object> static devcb_base &set_iowr(device_t &device, _Object object) { return downcast<ra17xx_device &>(device).m_iowr.set_callback(object); } +protected: + // device-level overrides + virtual void device_start(); + virtual void device_reset(); + +private: + UINT8 m_line[16]; //!< input/output flip-flops for 16 I/O lines + UINT8 m_bl; //!< value of BL during the most recent output + bool m_enable; //!< true if outputs are enabled + devcb_read8 m_iord; //!< input line (read, offset = line, data = 0/1) + devcb_write8 m_iowr; //!< output line (write, offset = line, data = 0/1) +}; + +extern const device_type RA17XX; + +#endif /* __RA17XX_H__ */ |