/* */
/* */
/* */
-/* (C) 2015 Groepaz/Hitmen */
-/* */
+/* (w) 2015 Groepaz/Hitmen (groepaz@gmx.net) */
+/* based on technical reference by PeT (mess@utanet.at) */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
# error This module may only be used when compiling for the Gamate!
#endif
+#define AUDIO_BASE 0x4000
+
+/*
+ base clock cpu clock/32 ?
+
+0/1: 1. channel(right): 12 bit frequency: right frequency 0 nothing, 1 high;
+ 3 23khz; 4 17,3; 10 6,9; 15 4.6; $60 720hz; $eff 18,0; $fff 16,9 hz)
+ (delay clock/32)
+2/3: 2. channel(left): 12 bit frequency
+4/5: 3. channel(both): 12 bit frequency
+6: 0..5 noise frequency 0 fast 1f slow (about 500us) 15.6ns--> clock/32 counts
+7 control (hinibble right)
+ bit 0: right channel high (full cycle, else square pulse/tone)
+ bit 1: left channel high
+ bit 2: both channel high
+ bit 3: set right tone (else noise)
+ bit 4: set left channel normal
+ bit 5: set both normal
+ bits 30: 11 high, 10 square, 01 noise, 00 noise only when square high
+ noise means switches channel to ad converter based noise algorithmen
+ (white noise shift register 17bit wide, repeats after about 130000 cycles)
+ probably out=!bit16, bit0=bit16 xor bit13; runs through, so start value anything than 0
+8: 1st volume: 0..3 square volume; bit 4 envelope (higher priority)
+9: 2nd volume
+10: 3rd volume
+11/12: envelope delay time 0 fast, 0xffff slow/nearly no effect (2 22us, 4 56us)
+ frequency $800, envelope $10 2 times in pulse high time (4*16*16)
+13: envelope control
+ 0-3 one time falling
+ 4-7 one time rising
+ 8 falling
+ 9 one time falling
+ a starts with down falling, rising; same falling time, but double/longer cycle
+ b one time falling, on
+ c rising
+ d one time rising, on
+ e rising, falling (double cycle before restart)
+ f one time rising
+ bit 0: once only
+ bit 1: full tone
+ bit 2: start rising (else falling)
+ bit 3:
+*/
+
+/* LCD
+
+ resolution 160x152 in 4 greys/greens
+ 2 256x256 sized bitplanes (2x 8kbyte ram)
+*/
+#define LCD_BASE 0x5000
+
+#define LCD_MODE 0x5001
+/*
+ bit 3..0 (from zeropage 15)
+ bit 0 set no normal screen display, seldom scrolling effects on screen;
+ bytes written to somewhat actual display refresh position!?
+ bytes read "random"
+ bit 1,2,3 no effect
+ bit 4 swaps plane intensity
+ bit 5 ? display effect
+ bit 6 on y auto increment (else auto x increment), reading
+ bit 7 ? lcd flickering
+*/
+#define LCD_MODE_INC_Y 0x40
+
+#define LCD_XPOS 0x5002 /* smooth scrolling X */
+#define LCD_YPOS 0x5003 /* smooth scrolling Y */
+/*
+ smooth scrolling until $c8 with 200 limit
+ after 200 display if ((value & 0xf) < 8) display of (value & 0xf) - 8
+ chaos lines from value + current line from plane 2 only then lines starting
+ with zero (problematic 200 limit/overrun implementation!?)
+*/
+#define LCD_X 0x5004 /* x-addr */
+/*
+ bit 5,6 no effect
+ bit 7 0 1st/1 2nd bitplane
+*/
+#define LCD_XPOS_PLANE1 0x00
+#define LCD_XPOS_PLANE2 0x80
+
+#define LCD_Y 0x5005 /* y-addr */
+
+#define LCD_READ 0x5006 /* read from RAM (no auto inc?) */
+#define LCD_DATA 0x5007 /* write to RAM */
+
+/* BIOS zeropage usage */
+
+/* locations 0x0a-0x0c, 0x0e-0x11 and 0xe8 are in use by the BIOS IRQ/NMI handlers */
+#define ZP_NMI_4800 0x0a /* content of I/O reg 4800 gets copied here each NMI */
+
+#define ZP_IRQ_COUNT 0x0b /* increments once per IRQ, used elsewhere in the
+ BIOS for synchronisation purposes */
+#define ZP_IRQ_CTRL 0x0c /* if 0 then cartridge irq stubs will not get called */
+
+/* each of the following 4 increments by 1 per IRQ - it is _not_ a 32bit
+ counter (see code at $ffa6 in BIOS)
+ these are not used elsewhere in the bios and can be (re)set as needed by
+ the user.
+*/
+#define ZP_IRQ_CNT1 0x0e
+#define ZP_IRQ_CNT2 0x0f
+#define ZP_IRQ_CNT3 0x10
+#define ZP_IRQ_CNT4 0x11
+
+#define ZP_NMI_FLAG 0xe8 /* set to 0xff each NMI */
+
+/* constants for the conio implementation */
+#define COLOR_BLACK 0x03
+#define COLOR_WHITE 0x00
+
+#define CH_HLINE 1
+#define CH_VLINE 2
+#define CH_CROSS 3
+#define CH_ULCORNER 4
+#define CH_URCORNER 5
+#define CH_LLCORNER 6
+#define CH_LRCORNER 7
+#define CH_TTEE 8
+#define CH_BTEE 9
+
+#define CH_RTEE 11
+#define CH_LTEE 12
+
+#define CH_ENTER 13
+#define CH_PI 18
+
+#define TV_NTSC 0
+#define TV_PAL 1
+#define TV_OTHER 2
+
+/* No support for dynamically loadable drivers */
+#define DYN_DRV 0
+
+/* Masks for joy_read */
+#define JOY_UP_MASK 0x01
+#define JOY_DOWN_MASK 0x02
+#define JOY_LEFT_MASK 0x04
+#define JOY_RIGHT_MASK 0x08
+#define JOY_BTN_1_MASK 0x10
+#define JOY_BTN_2_MASK 0x20
+#define JOY_BTN_3_MASK 0x40
+#define JOY_BTN_4_MASK 0x80
+
+#define JOY_BTN_A_MASK JOY_BTN_1_MASK
+#define JOY_BTN_B_MASk JOY_BTN_2_MASK
+#define JOY_START_MASK JOY_BTN_3_MASK
+#define JOY_SELECT_MASK JOY_BTN_4_MASK
+
+#define JOY_BTN_A(v) ((v) & JOY_BTN_A_MASK)
+#define JOY_BTN_B(v) ((v) & JOY_BTN_B_MASK)
+#define JOY_START(v) ((v) & JOY_START_MASK)
+#define JOY_SELECT(v) ((v) & JOY_SELECT_MASK)
+
+/* The addresses of the static drivers */
+extern void gamate_stdjoy_joy[]; /* Referred to by joy_static_stddrv[] */
+
+void waitvsync (void);
+/* Wait for start of next frame */
+/* NOTE: all Gamate are "NTSC" */
+#define get_tv() TV_NTSC
+/* Return the video mode the machine is using. */
/* End of gamate.h */
#endif
projects / cc65 / blobdiff