/* i1620_defs.h: IBM 1620 simulator definitions

   Copyright (c) 2002-2003, Robert M. Supnik

   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
   ROBERT M SUPNIK 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 Robert M Supnik shall not
   be used in advertising or otherwise to promote the sale, use or other dealings
   in this Software without prior written authorization from Robert M Supnik.

   This simulator is based on the 1620 simulator written by Geoff Kuenning.
   I am grateful to Al Kossow, the Computer History Museum, and the IBM Corporate
   Archives for their help in gathering documentation about the IBM 1620.

   18-Oct-02	RMS	Fixed bug in ADDR_S macro (found by Hans Pufal)
*/

#include "sim_defs.h"					/* simulator defns */

/* Simulator stop codes */

#define STOP_HALT	1				/* HALT */
#define STOP_IBKPT	2				/* breakpoint */
#define STOP_INVINS	3				/* invalid instruction */
#define STOP_INVDIG	4				/* invalid digit */
#define STOP_INVCHR	5				/* invalid char */
#define STOP_INVIND	6				/* invalid indicator */
#define STOP_INVPDG	7				/* invalid P addr digit */
#define STOP_INVPAD	8				/* invalid P addr */
#define STOP_INVPIA	9				/* invalid P indir addr */
#define STOP_INVQDG	10				/* invalid Q addr digits */
#define STOP_INVQAD	11				/* invalid Q addr */
#define STOP_INVQIA	12				/* invalid Q indir addr */
#define STOP_INVIO	13				/* invalid IO address */
#define STOP_INVRTN	14				/* invalid return */
#define STOP_INVFNC	15				/* invalid function */
#define STOP_INVIAD	16				/* invalid instr addr */
#define STOP_INVSEL	17				/* invalid select */
#define STOP_INVIDX	18				/* invalid index instr */
#define STOP_INVEAD	19				/* invalid even addr */
#define STOP_INVDCF	20				/* invalid DCF addr */
#define STOP_INVDRV	21				/* invalid disk drive */
#define STOP_INVDSC	22				/* invalid disk sector */
#define STOP_INVDCN	23				/* invalid disk count */
#define STOP_INVDBA	24				/* invalid disk buf addr */
#define STOP_DACERR	25				/* disk addr comp err */
#define STOP_DWCERR	26				/* disk wr check err */
#define STOP_CYOERR	27				/* cylinder ovflo err */
#define STOP_WRLERR	28				/* wrong rec lnt err */
#define STOP_CCT	29				/* runaway CCT */
#define STOP_FWRAP	30				/* field wrap */
#define STOP_RWRAP	31				/* record wrap */
#define STOP_NOCD	32				/* no card in reader */
#define STOP_OVERFL	33				/* overflow */
#define STOP_EXPCHK	34				/* exponent error */
#define STOP_WRADIS	35				/* write addr disabled */
#define STOP_FPLNT	36				/* invalid fp length */
#define STOP_FPUNL	37				/* fp lengths unequal */
#define STOP_FPMF	38				/* no flag on exp */
#define STOP_FPDVZ	39				/* divide by zero */

/* Memory */

#define MAXMEMSIZE	60000				/* max mem size */
#define MEMSIZE		(cpu_unit.capac)		/* act memory size */

/* Processor parameters */

#define INST_LEN	12				/* inst length */
#define ADDR_LEN	5				/* addr length */
#define MUL_TABLE	100				/* multiply table */
#define MUL_TABLE_LEN	200
#define ADD_TABLE	300				/* add table */
#define ADD_TABLE_LEN	100
#define IDX_A		300				/* index A base */
#define IDX_B		340				/* index B base */
#define PROD_AREA	80				/* product area */
#define PROD_AREA_LEN	20				/* product area */
#define PROD_AREA_END	(PROD_AREA + PROD_AREA_LEN)

/* Branch indicator codes */

#define NUM_IND		100				/* number of indicators */

#define IN_SW1		1				/* sense switch 1 */
#define IN_SW2		2				/* sense switch 2 */
#define IN_SW3		3				/* sense switch 3 */
#define IN_SW4		4				/* sense switch 4 */
#define IN_RDCHK	6				/* read check (I/O error) */
#define IN_WRCHK	7				/* write check (I/O error) */
#define IN_LAST		9				/* last card was just read */
#define IN_HP		11				/* high or positive result */
#define IN_EZ		12				/* equal or zero result */
#define IN_HPEZ		13				/* high/positive or equal/zero */
#define IN_OVF		14				/* overflow */
#define IN_EXPCHK	15				/* floating exponent check */
#define IN_MBREVEN	16				/* even parity check */
#define IN_MBRODD	17				/* odd parity check */
#define IN_ANYCHK	19				/* any of read, write, even/odd */
#define IN_PRCHK	25				/* printer check */
#define IN_IXN		30				/* IX neither */
#define IN_IXA		31				/* IX A band */
#define IN_IXB		32				/* IX B band */
#define IN_PRCH9	33				/* printer chan 9 */
#define IN_PRCH12	34				/* printer chan 12 */
#define IN_PRBSY	35				/* printer busy */
#define IN_DACH		36				/* disk addr/data check */
#define IN_DWLR		37				/* disk rec length */
#define IN_DCYO		38				/* disk cyl overflow */
#define IN_DERR		39				/* disk any error */

/* I/O channel codes */

#define NUM_IO		100				/* number of IO chan */

#define IO_TTY		1				/* console typewriter */
#define IO_PTP		2				/* paper-tape punch */
#define IO_PTR		3				/* paper-tape reader */
#define IO_CDP		4				/* card punch */
#define IO_CDR		5				/* card reader */
#define IO_DSK		7				/* disk */
#define IO_LPT		9				/* line printer */
#define IO_BTP		32				/* binary ptp */
#define IO_BTR		33				/* binary ptr */

#define LPT_WIDTH	120				/* line print width */
#define CCT_LNT		132				/* car ctrl length */

#define CRETIOE(f,c)	return ((f)? (c): SCPE_OK)

/* Memory representation: flag + BCD digit per byte */

#define FLAG		0x10
#define DIGIT		0x0F
#define REC_MARK	0xA
#define NUM_BLANK	0xC
#define GRP_MARK	0xF
#define BAD_DIGIT(x)	((x) > 9)

/* Instruction format */

#define I_OP		0				/* opcode */
#define I_P		2				/* P start */
#define I_PL		6				/* P end */
#define I_Q		7				/* Q start */
#define I_QL		11				/* Q end */
#define I_IO		8				/* IO select */
#define I_BR		8				/* indicator select */
#define I_CTL		10				/* control select */
#define I_SEL		11				/* BS select */

#define ADDR_A(x,a)	((((x) + (a)) >= MEMSIZE)? ((x) + (a) - MEMSIZE): ((x) + (a)))
#define ADDR_S(x,a)	(((x) < (a))? ((x) - (a) + MEMSIZE): ((x) - (a)))
#define PP(x)		x = ADDR_A(x,1)
#define MM(x)		x = ADDR_S(x,1)

/* CPU options, stored in cpu_unit.flags */
/* Decoding flags must be part of the same definition set */

#define UNIT_SCP	((1 << UNIT_V_UF) - 1)		/* mask of SCP flags */
#define IF_MII		(1 << (UNIT_V_UF + 0))		/* model 2 */
#define IF_DIV		(1 << (UNIT_V_UF + 1))		/* automatic divide */
#define IF_IA		(1 << (UNIT_V_UF + 2))		/* indirect addressing */
#define IF_EDT		(1 << (UNIT_V_UF + 3))		/* edit */
#define IF_FP		(1 << (UNIT_V_UF + 4))		/* floating point */
#define IF_BIN		(1 << (UNIT_V_UF + 5))		/* binary */
#define IF_IDX		(1 << (UNIT_V_UF + 6))		/* indexing */
#define IF_VPA		(1 << (UNIT_V_UF + 7))		/* valid P addr */
#define IF_VQA		(1 << (UNIT_V_UF + 8))		/* valid Q addr */
#define IF_4QA		(1 << (UNIT_V_UF + 9))		/* 4 char Q addr */
#define IF_NQX		(1 << (UNIT_V_UF + 10))		/* no Q indexing */
#define IF_IMM		(1 << (UNIT_V_UF + 11))		/* immediate */
#define UNIT_BCD	(1 << (UNIT_V_UF + 12))		/* BCD coded */
#define UNIT_MSIZE	(1 << (UNIT_V_UF + 13))		/* fake flag */
#define ALLOPT		(IF_DIV + IF_IA + IF_EDT + IF_FP + IF_BIN + IF_IDX)
#define MI_OPT		(IF_DIV + IF_IA + IF_EDT + IF_FP)
#define MI_STD		(IF_DIV + IF_IA + IF_EDT)
#define MII_OPT		(ALLOPT)
#define MII_STD		(IF_DIV + IF_IA + IF_EDT + IF_BIN + IF_IDX)

/* Add status codes */

#define ADD_NOCRY	0				/* no carry out */
#define ADD_CARRY	1				/* carry out */
#define ADD_SIGNC	2				/* sign change */

/* Opcodes */

enum opcodes {
	OP_FADD = 1, OP_FSUB, OP_FMUL,			/* 00 - 09 */
	OP_FSL = 5, OP_TFL, OP_BTFL, OP_FSR, OP_FDIV,
	OP_BTAM = 10, OP_AM, OP_SM, OP_MM, OP_CM,	/* 10 - 19 */
	OP_TDM, OP_TFM, OP_BTM, OP_LDM, OP_DM,
	OP_BTA = 20, OP_A, OP_S, OP_M, OP_C,		/* 20 - 29 */
	OP_TD, OP_TF, OP_BT, OP_LD, OP_D,
	OP_TRNM = 30, OP_TR, OP_SF, OP_CF, OP_K,	/* 30 - 39 */
	OP_DN, OP_RN, OP_RA, OP_WN, OP_WA,
	OP_NOP = 41, OP_BB, OP_BD, OP_BNF,		/* 40 - 49 */
	OP_BNR, OP_BI, OP_BNI, OP_H, OP_B,
	OP_BNG = 55,
	OP_BS = 60, OP_BX, OP_BXM, OP_BCX, OP_BCXM,	/* 60 - 69 */
	OP_BLX, OP_BLXM, OP_BSX,
	OP_MA = 70, OP_MF, OP_TNS, OP_TNF,		/* 70 - 79 */
							/* 80 - 89 */
	OP_BBT = 90, OP_BMK, OP_ORF, OP_ANDF, OP_CPLF,	/* 90 - 99 */
	OP_EORF, OP_OTD, OP_DTO };
