// license:BSD-3-Clause // copyright-holders:Juergen Buchmueller /***************************************************************************** * * Xerox AltoII RAM related tasks * *****************************************************************************/ #ifdef ALTO2_DEFINE_CONSTANTS #define ALTO2_UCODE_PAGE_SIZE 02000 //!< number of words of microcode #define ALTO2_UCODE_PAGE_MASK (ALTO2_UCODE_PAGE_SIZE-1) //!< mask for microcode ROM/RAM address #else // ALTO2_DEFINE_CONSTANTS #ifndef _A2RAM_H_ #define _A2RAM_H_ //! BUS source for RAM related tasks enum { bs_ram_read_slocation= bs_task_3, //!< ram related: read S register bs_ram_load_slocation= bs_task_4 //!< ram related: load S register }; //!< F1 functions for RAM related tasks enum { f1_ram_swmode = f1_task_10, //!< f1 10: switch mode to CROM/CRAM in same page f1_ram_wrtram = f1_task_11, //!< f1 11: start WRTRAM cycle f1_ram_rdram = f1_task_12, //!< f1 12: start RDRAM cycle f1_ram_load_rmr = f1_task_13, //!< f1 13: load the reset mode register f1_ram_load_srb = f1_task_13 //!< f1 13: load the S register bank from BUS[12-14] }; void bs_early_read_sreg(); //!< bus source: drive bus by S register or M (MYL), if rsel is = 0 void bs_early_load_sreg(); //!< bus source: load S register puts garbage on the bus void bs_late_load_sreg(); //!< bus source: load S register from M void branch_ROM(const char *from, int page); //!< branch to ROM page void branch_RAM(const char *from, int page); //!< branch to RAM page void f1_late_swmode(); //!< F1 func: switch to micro program counter BUS[6-15] in other bank void f1_late_wrtram(); //!< F1 func: start WRTRAM cycle void f1_late_rdram(); //!< F1 func: start RDRAM cycle void f1_late_load_rmr(); //!< F1 func: load the reset mode register void f1_late_load_srb(); //!< F1 func: load the S register bank from BUS[12-14] void init_ram(int task); //!< called by RAM related tasks void exit_ram(); //!< deinitialize the RAM related tasks void reset_ram(); //!< reset the RAM related tasks #endif // A2RAM_H #endif // ALTO2_DEFINE_CONSTANTS