/* ioc-cont.c: Intel IPC DBB adapter Copyright (c) 2010, William A. Beech Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of William A. Beech shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from William A. Beech. MODIFICATIONS: 27 Jun 16 - Original file. NOTES: */ #include "system_defs.h" /* system header in system dir */ //dbb status flag bits #define OBF 1 #define IBF 2 #define F0 4 #define CD 8 //system status bits #define IIM 16 //illegal interrupt mask #define IDT 32 //illegal data transfer #define IC 64 //illegal command #define DE 128 //device error //dbb command codes #define PACIFY 0x00 //Resets IOC and its devices #define ERESET 0x01 //Resets device-generated error (not used by standard devices) #define SYSTAT 0x02 //Returns subsystem status byte to master #define DSTAT 0x03 //Returns device status byte to master #define SRQDAK 0x04 //Enables input of device interrupt acknowledge mask from master #define SRQACK 0x05 //Clears IOC subsystem interrupt request #define SRQ 0x06 //Tests ability of IOC to forward an interrupt request to the master #define DECHO 0x07 //Tests ability of IOC to echo data byte sent by master #define CSMEM 0x08 //Requests IOC to checksum on-board ROM. Returns pass/fail #define TRAM 0x09 //Requests IOC to test on-board RAM. Returns pass/fail #define SINT 0x0A //Enables specified device interrupt from IOC #define CRTC 0x10 //Requests data byte output to the CRT monitor #define CRTS 0x11 //Returns CRT status byte to master #define KEYC 0x12 //Requests data byte input from the keyboard #define KSTC 0x13 //Returns keyboard status byte to master #define WPBC 0x15 //Enables input of first of five bytes that define current diskette operation #define WPBCC 0x16 //Enables input of each of four bytes that follow WPBC #define WDBC 0x17 //Enables input of diskette write bytes from master #define RDBC 0x19 //Enables output of diskette read bytes to master #define RRSTS 0x1B //Returns diskette result byte to master #define RDSTS 0x1C //Returns diskette device status byte to master /* external globals */ extern uint16 PCX; /* function prototypes */ t_stat ioc_cont_cfg(uint8 base, uint8 devnum); t_stat ioc_cont_reset (DEVICE *dptr); uint8 ioc_cont0(t_bool io, uint8 data, uint8 devnum); /* ioc_cont*/ uint8 ioc_cont1(t_bool io, uint8 data, uint8 devnum); /* ioc_cont*/ /* external function prototypes */ extern uint8 reg_dev(uint8 (*routine)(t_bool, uint8, uint8), uint8, uint8); /* globals */ uint8 dbb_stat; uint8 dbb_cmd; uint8 dbb_in; uint8 dbb_out; UNIT ioc_cont_unit[] = { { UDATA (0, 0, 0) }, /* ioc_cont*/ }; REG ioc_cont_reg[] = { { HRDATA (CONTROL0, ioc_cont_unit[0].u3, 8) }, /* ioc_cont */ { NULL } }; DEBTAB ioc_cont_debug[] = { { "ALL", DEBUG_all }, { "FLOW", DEBUG_flow }, { "READ", DEBUG_read }, { "WRITE", DEBUG_write }, { "XACK", DEBUG_xack }, { "LEV1", DEBUG_level1 }, { "LEV2", DEBUG_level2 }, { NULL } }; /* address width is set to 16 bits to use devices in 8086/8088 implementations */ DEVICE ioc_cont_dev = { "IOC-CONT", //name ioc_cont_unit, //units ioc_cont_reg, //registers NULL, //modifiers 1, //numunits 16, //aradix 16, //awidth 1, //aincr 16, //dradix 8, //dwidth NULL, //examine NULL, //deposit ioc_cont_reset, //reset NULL, //boot NULL, //attach NULL, //detach NULL, //ctxt 0, //flags 0, //dctrl ioc_cont_debug, //debflags NULL, //msize NULL //lname }; // ioc_cont configuration t_stat ioc_cont_cfg(uint8 base, uint8 devnum) { sim_printf(" ioc-cont[%d]: at base port 0%02XH\n", devnum, base & 0xFF); reg_dev(ioc_cont0, base, devnum); reg_dev(ioc_cont1, base + 1, devnum); return SCPE_OK; } /* Reset routine */ t_stat ioc_cont_reset(DEVICE *dptr) { dbb_stat = 0x00; /* clear DBB status */ return SCPE_OK; } /* I/O instruction handlers, called from the CPU module when an IN or OUT instruction is issued. */ /* IOC data port functions */ uint8 ioc_cont0(t_bool io, uint8 data, uint8 devnum) { if (io == 0) { /* read data port */ dbb_stat &= ~OBF; //reset OBF flag return dbb_out; } else { /* write data port */ dbb_in = data; dbb_stat |= IBF; return 0; } } /* IOC control port functions */ uint8 ioc_cont1(t_bool io, uint8 data, uint8 devnum) { int temp; if (io == 0) { /* read status port */ if ((dbb_stat & F0) && (dbb_stat & IBF)) { return dbb_stat; } if ((dbb_stat & F0) && (dbb_stat & OBF)) { temp = dbb_stat; dbb_stat &= ~OBF; //reset OBF flag return temp; } if (dbb_stat & F0) { return dbb_stat; } return dbb_stat; } else { /* write command port */ dbb_stat |= F0; dbb_cmd = data; switch(dbb_cmd){ case PACIFY: //reset IOC and its devices dbb_stat = 0; break; case ERESET: //reset device-generated error(not used by std devices) break; case SYSTAT: //returns subsystem status byte to master dbb_out = 0; dbb_stat |= OBF; dbb_stat &= ~CD; break; case DSTAT: //returns device status to master break; case SRQDAK: //enables input of device int ack mask from master break; case SRQACK: //clears IOC subsystem int req break; case SRQ: //tests ability of IOC to forward an int req to master break; case DECHO: //tests ability of IOC to echo data byte sent by master break; case CSMEM: //requests IOC to checksum onboard ROM break; case TRAM: //requests IOC to test onboard RAM break; case SINT: //enables specified device int from IOC break; case CRTC: //requests data byte output to CRT break; case CRTS: //return CRT status byte to master dbb_out = 0; dbb_stat |= F0; break; case KEYC: //request data byte from KBD break; case KSTC: //return KBD status byte to master dbb_out = 0; break; case WPBC: //enables input of first 5 bytes of IOPB break; case WPBCC: //enables input of 4 bytes that follow WPDC break; case WDBC: //enables input of diskette write bytes from master break; case RDBC: //enables output of diskette read bytes to master. break; case RRSTS: //returns diskette result byte to master break; case RDSTS: //returns diskette device status byte to master dbb_out = 0x80; //not ready dbb_stat |= IBF; break; default: sim_printf(" IOC-CONT: Unknown command %02X PCX=%04X\n", dbb_cmd, PCX); } return 0; } } /* end of ioc-cont.c */