1 // license:BSD-3-Clause 2 // copyright-holders:Curt Coder 3 /********************************************************************** 4 5 MOS 8726R1 DMA Controller emulation 6 7 ********************************************************************** 8 _____ _____ 9 /RESET 1 |* \_/ | 64 Vcc 10 /IRQ 2 | | 63 BS 11 DOTCLK 3 | | 62 CAS1 12 R/W 4 | | 61 CAS0 13 1 MHz 5 | | 60 RAS1 14 /CS 6 | | 59 RAS0 15 /BA 7 | | 58 /DWE 16 /DMA 8 | | 57 DD0 17 D7 9 | | 56 DD1 18 D6 10 | | 55 DD2 19 D5 11 | | 54 DD3 20 D4 12 | | 53 DD4 21 D3 13 | | 52 DD5 22 D2 14 | | 51 DD6 23 D1 15 | MOS8726 | 50 DD7 24 D0 16 | MOS8726R1 | 49 Vss 25 Vss 17 | | 48 MA8 26 A15 18 | | 47 MA7 27 A14 19 | | 46 MA6 28 A13 20 | | 45 MA5 29 A12 21 | | 44 MA4 30 A11 22 | | 43 MA3 31 A10 23 | | 42 MA2 32 A9 24 | | 41 MA1 33 A8 25 | | 40 MA0 34 A7 26 | | 39 TEST 35 A6 27 | | 38 Vss 36 A5 28 | | 37 Vcc 37 A4 29 | | 36 /ROMSEL 38 A3 30 | | 35 /ROML 39 A2 31 | | 34 /ROMH 40 A1 32 |_____________| 33 A0 41 42 **********************************************************************/ 43 44 #ifndef MAME_MACHINE_MOS8726_H 45 #define MAME_MACHINE_MOS8726_H 46 47 #pragma once 48 49 50 //************************************************************************** 51 // TYPE DEFINITIONS 52 //************************************************************************** 53 54 // ======================> mos8726_device 55 56 class mos8726_device : public device_t, 57 public device_execute_interface 58 { 59 public: 60 // construction/destruction 61 mos8726_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); 62 63 uint8_t read(offs_t offset); 64 void write(offs_t offset, uint8_t data); 65 66 DECLARE_WRITE_LINE_MEMBER( bs_w ); 67 68 int romsel_r(int roml, int romh); 69 70 protected: 71 // device-level overrides 72 virtual void device_start() override; 73 virtual void device_reset() override; 74 virtual void execute_run() override; 75 76 int m_icount; 77 int m_bs; 78 }; 79 80 81 // device type definition 82 DECLARE_DEVICE_TYPE(MOS8726, mos8726_device) 83 84 #endif // MAME_MACHINE_MOS8726_H 85