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NES mapper experiments
This commit is contained in:
Karol Stasiak
parent
fa34402749
commit
fcf4af6c55
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@ -33,21 +33,33 @@ The minimal Famicom program thus looks like this:
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To use a mapper of your choice, create a new `.ini` file with the definitions you need.
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The most important ones are `[output]format` and `[allocation]segments`.
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Currently, its a bit inconvenient to create programs using mappers that change the bank containing the interrupt vectors.
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Therefore, it's recommended to stick to mappers that have a fixed bank at the end of the address space.
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Mappers that should be fine: NROM (0), CNROM (1), UxROM(2), MMC2 (9), MMC3 (4), MMC4 (10), MMC6 (4).
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Mappers that can have arbitrary bank at the end and are therefore not recommended: MMC1 (1), MMC5 (5).
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You should define at least three segments:
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* `default` – from $200 to $7FF, it will represent the physical RAM of the console.
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* `chrrom` (sample name) – from $0000 to $3FFF, it will represent the CHRROM (if you need more).
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* `chrrom` (sample name) – from $0000 to $1FFF, it will represent the CHRROM
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(if you need more, you can make it bigger, up to $ffff, or even add another segment of CHRROM).
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Put there only arrays with pattern tables. Don't read from them directly, it won't work.
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* `prgrom` (sample name) – from either $8000 or $C000 to $FFFF, it will contain the code of your program.
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* `prgrom` (sample name) – it will contain the code of your program and read-only data.
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Each segment should be defined in a range it is going to be switched into.
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You should set the `default_code_segment` to the segment that contains the $FFxx addresses.
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If your mapper supports it, you can add more CHRROM or PRGROM segments,
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just specify them correctly in the `[output]format` tag.
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The `[output]format` tag should contain a valid iNES header of the mapper of your choice and then all the segments in proper order.
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The `[output]format` tag should contain a valid iNES or NES 2.0 header of the mapper of your choice
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and then all the segments in proper order (first PRGROM, then CHRROM).
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See [the MMC4 example](../../include/nes_mmc4.ini) to see how it can be done.
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See [the NesDev wiki](https://wiki.nesdev.com/w/index.php/INES) for more info about the iNES file format.
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See [the NesDev wiki](https://wiki.nesdev.com/w/index.php/NES_2.0) for more info about the NES 2.0 file format.
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@ -27,7 +27,9 @@ The following platforms are currently supported:
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* `pet` – Commodore PET
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* `nes_small` – a tiny 32K PRGROM + 8K CHRROM Famicom/NES program
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* `nes_small` – a tiny 32K PRGROM + 8K CHRROM Famicom/NES program, using iNES mapper 0 (NROM)
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* `nes_mcc4` – a 128K PRGROM + 128K CHRROM + extra 8KRAM Famicom/NES program, using iNES mapper 10 (MMC4)
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For more complex programs, you need to create your own "platform" definition.
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Read [the NES programming guide](./famicom-programming-guide.md) for more info.
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@ -28,6 +28,8 @@
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* [NES 101 tutorial example](nes/nestest.mfk) – a port of the tutorial example from the NES 101 tutorial by Michael Martin
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* [MMC4 example](nes/nestest_mmc4.mfk) – the same thing as above, but uses a MMC4 mapper just to test bankswitching
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## Apple II examples
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* [Bell](apple2/bell.mfk) – a program that goes \*ding!\*
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@ -1,4 +1,5 @@
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// Based upon the example code from NES 101 tutorial by Michael Martin
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// compile with -t nes_small
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void main() {
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init_graphics()
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269
examples/nes/nestest_mmc4.mfk
Normal file
269
examples/nes/nestest_mmc4.mfk
Normal file
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@ -0,0 +1,269 @@
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// Based upon the example code from NES 101 tutorial by Michael Martin
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// compile with -t nes_mmc4
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void main() {
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init_graphics()
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init_input()
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init_sound()
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ppu_ctrl = %10001000
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ppu_mask = %00011110
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while(true){}
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}
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void nmi() {
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set_prg_bank(1)
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scroll_screen()
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set_prg_bank(2)
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update_sprite()
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set_prg_bank(3)
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react_to_input()
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}
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void irq() {
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}
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array oam_buffer [256] @$200
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byte scroll
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byte a
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segment(ram) sbyte dx
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void init_graphics() {
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set_chr_bank0($06)
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set_chr_bank1($1A)
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init_sprites()
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set_prg_bank(6)
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load_palette()
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load_name_tables()
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init_scrolling()
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}
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void init_input() {
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a = 0
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}
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void init_sound() {
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apu_status = 1
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apu_pulse1_sweep = 0
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apu_frame_counter = $40
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}
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void init_sprites() {
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byte i
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for i,255,downto,0 {
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oam_buffer[i] = 0
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}
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oam_buffer[0] = $70
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oam_buffer[1] = 1
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oam_buffer[3] = 1
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dx = 1
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}
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segment(prgrom6)
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noinline void load_palette() {
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byte i
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ppu_set_addr($3f00)
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for i,0,until,palette.length {
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ppu_write_data(palette[i])
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}
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}
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segment(prgrom6)
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noinline void load_name_tables() {
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pointer p
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byte page_count
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byte b
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read_ppu_status()
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p = bg.addr
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ppu_set_addr($2400)
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for page_count,0,until,4 {
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for b,0,until,255 {
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ppu_write_data(p[b])
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}
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p.hi += 1
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}
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for page_count,0,until,4 {
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for b,0,until,255 {
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ppu_write_data(0)
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}
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}
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}
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void init_scrolling() {
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scroll = 240
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}
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segment(prgrom2)
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noinline void update_sprite() {
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ppu_oam_dma_write(oam_buffer.addr.hi)
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if oam_buffer[3] == 0 {
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dx = 1
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high_c()
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} else if oam_buffer[3] == 255-8 {
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dx = -1
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high_c()
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}
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oam_buffer[3] += dx
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}
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segment(prgrom3)
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noinline void react_to_input() {
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strobe_joypad()
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if read_joypad1() & 1 != 0 { // A button
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reverse_dx()
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}
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read_joypad1() // B button
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read_joypad1() // Select button
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read_joypad1() // Start button
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if read_joypad1() & 1 != 0 { // Up button
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if oam_buffer[0] > 7 { oam_buffer[0] -= 1}
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}
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if read_joypad1() & 1 != 0 { // Down button
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if oam_buffer[0] < 223 { oam_buffer[0] += 1}
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}
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}
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segment(prgrom3)
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void reverse_dx() {
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dx = 0 - dx
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low_c()
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}
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segment(prgrom3)
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void low_c() {
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apu_pulse1_ctrl = $84
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apu_pulse1_period = $9AA
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}
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segment(prgrom2)
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void high_c() {
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apu_pulse1_ctrl = $86
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apu_pulse1_period = $869
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}
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segment(prgrom1)
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noinline void scroll_screen() {
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ppu_write_data(0)
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if scroll != 0 {
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scroll -= 1
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ppu_set_scroll(0, scroll)
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}
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}
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array bg = [
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" " ascii,
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"12345678901234567890123456789012" ascii,
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" " ascii,
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" " ascii,
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" PRESENTING NES 101 " ascii,
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" A GUIDE FOR OTHERWISE " ascii,
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" EXPERIENCED PROGRAMMERS " ascii,
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" " ascii,
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" TUTORIAL FILE BY " ascii,
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" MICHAEL MARTIN " ascii,
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" " ascii,
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" " ascii,
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" " ascii,
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" PRESS UP AND DOWN TO SHIFT " ascii,
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" THE SPRITE " ascii,
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" " ascii,
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" PRESS A TO REVERSE DIRECTION" ascii,
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" " ascii,
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" " ascii,
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" " ascii,
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" " ascii,
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" " ascii,
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" " ascii,
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"CHARACTER SET HIJACKED FROM " ascii,
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"COMMODORE BUSINESS MACHINES " ascii,
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" (C64'S CHARACTER ROM)" ascii,
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" " ascii,
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"READY. " ascii,
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" " ascii,
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" " ascii,
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$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,
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$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,
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$00,$00,$00,$00,$00,$00,$00,$00,$F0,$F0,$F0,$F0,$F0,$F0,$F0,$F0,
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$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$0F,$0F,$0F,$0F,$0F,$0F,$0F,$0F
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]
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array palette = [
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$0E,$00,$0E,$19,$00,$00,$00,$00,$00,$00,$00,$00,$01,$00,$01,$21,
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$0E,$20,$22,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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]
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segment(chrrom0)
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array charset @$6200 = [
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$00,$00,$00,$00,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$18,$18,$18,$18,$00,$00,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$66,$66,$00,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$66,$FF,$66,$FF,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$18,$3E,$60,$3C,$06,$7C,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$62,$66,$0C,$18,$30,$66,$46,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$3C,$38,$67,$66,$3F,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$06,$0C,$18,$00,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$0C,$18,$30,$30,$30,$18,$0C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$30,$18,$0C,$0C,$0C,$18,$30,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$66,$3C,$FF,$3C,$66,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$18,$18,$7E,$18,$18,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$00,$00,$00,$00,$18,$18,$30,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$00,$00,$7E,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$00,$00,$00,$00,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$03,$06,$0C,$18,$30,$60,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$6E,$76,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$18,$18,$38,$18,$18,$18,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$06,$0C,$30,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$06,$1C,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$06,$0E,$1E,$66,$7F,$06,$06,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7E,$60,$7C,$06,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$60,$7C,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7E,$66,$0C,$18,$18,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$66,$3C,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$66,$3E,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$00,$18,$00,$00,$18,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$00,$18,$00,$00,$18,$18,$30,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$0E,$18,$30,$60,$30,$18,$0E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$00,$7E,$00,$7E,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$70,$18,$0C,$06,$0C,$18,$70,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$06,$0C,$18,$00,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$6E,$6E,$60,$62,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$18,$3C,$66,$7E,$66,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7C,$66,$66,$7C,$66,$66,$7C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$60,$60,$60,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$78,$6C,$66,$66,$66,$6C,$78,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7E,$60,$60,$78,$60,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7E,$60,$60,$78,$60,$60,$60,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$60,$6E,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$66,$66,$7E,$66,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$18,$18,$18,$18,$18,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$1E,$0C,$0C,$0C,$0C,$6C,$38,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$6C,$78,$70,$78,$6C,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$60,$60,$60,$60,$60,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$63,$77,$7F,$6B,$63,$63,$63,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$76,$7E,$7E,$6E,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$66,$66,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7C,$66,$66,$7C,$60,$60,$60,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$66,$66,$66,$3C,$0E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7C,$66,$66,$7C,$78,$6C,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$66,$60,$3C,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7E,$18,$18,$18,$18,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$66,$66,$66,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$66,$66,$66,$66,$3C,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$63,$63,$63,$6B,$7F,$77,$63,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$66,$3C,$18,$3C,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$66,$66,$66,$3C,$18,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$7E,$06,$0C,$18,$30,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$30,$30,$30,$30,$30,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$0C,$12,$30,$7C,$30,$62,$FC,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$3C,$0C,$0C,$0C,$0C,$0C,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$18,$3C,$7E,$18,$18,$18,$18,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,
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$00,$10,$30,$7F,$7F,$30,$10,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
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]
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segment(chrrom1)
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array sprites @$A000 = [
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$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,
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$18,$24,$66,$99,$99,$66,$24,$18,$00,$18,$18,$66,$66,$18,$18,$00
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]
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64
include/nes_mmc4.ini
Normal file
64
include/nes_mmc4.ini
Normal file
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@ -0,0 +1,64 @@
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; a NES MMC4 cartridge, uses iNES mapper 10
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; 8×16 kB PRGROM and 32×4kB CHRROM
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; $c000–$ffff is assumed to be fixed to prgrom7, $8000-$bfff can be switched
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; uses horizontal mirroring:
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; - to use vertical mirroring, change byte #6 of the header from $A0 to $A1
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; uses extra 8K of RAM at $6000–$7fff that is not battery-backed:
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; - to disable it, change byte #10 of the header from $07 to 0 and remove the ram segment
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; - to make it battery-backed, change byte #10 of the header from $07 to $77
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; output file size: 262160 bytes
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[compilation]
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arch=ricoh
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modules=nes_hardware,nes_routines,default_panic,nes_mmc4
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ro_arrays=true
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[allocation]
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zp_pointers=all
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|
||||
segments=default,ram,prgrom0,prgrom1,prgrom2,prgrom3,prgrom4,prgrom5,prgrom6,prgrom7,chrrom0,chrrom1
|
||||
default_code_segment=prgrom7
|
||||
|
||||
segment_default_start=$200
|
||||
segment_default_end=$7ff
|
||||
|
||||
segment_ram_start=$6000
|
||||
segment_ram_end=$7fff
|
||||
|
||||
segment_prgrom7_start=$c000
|
||||
segment_prgrom7_end=$ffff
|
||||
|
||||
segment_prgrom0_start=$8000
|
||||
segment_prgrom0_end=$bfff
|
||||
|
||||
segment_prgrom1_start=$8000
|
||||
segment_prgrom1_end=$bfff
|
||||
|
||||
segment_prgrom2_start=$8000
|
||||
segment_prgrom2_end=$bfff
|
||||
|
||||
segment_prgrom3_start=$8000
|
||||
segment_prgrom3_end=$bfff
|
||||
|
||||
segment_prgrom4_start=$8000
|
||||
segment_prgrom4_end=$bfff
|
||||
|
||||
segment_prgrom5_start=$8000
|
||||
segment_prgrom5_end=$bfff
|
||||
|
||||
segment_prgrom6_start=$8000
|
||||
segment_prgrom6_end=$bfff
|
||||
|
||||
segment_chrrom0_start=$0000
|
||||
segment_chrrom0_end=$ffff
|
||||
|
||||
segment_chrrom1_start=$0000
|
||||
segment_chrrom1_end=$ffff
|
||||
|
||||
[output]
|
||||
style=single
|
||||
format=$4E,$45,$53,$1A, 8,16,$A0,8, 0,0,$07,0, 2,0,0,0, prgrom0:$8000:$bfff,prgrom1:$8000:$bfff,prgrom2:$8000:$bfff,prgrom3:$8000:$bfff,prgrom4:$8000:$bfff,prgrom5:$8000:$bfff,prgrom6:$8000:$bfff,prgrom7:$c000:$ffff,chrrom0:$0000:$ffff,chrrom1:$0000:$ffff
|
||||
|
||||
extension=nes
|
||||
|
||||
|
||||
32
include/nes_mmc4.mfk
Normal file
32
include/nes_mmc4.mfk
Normal file
|
|
@ -0,0 +1,32 @@
|
|||
asm inline void set_prg_bank(byte a) {
|
||||
STA $A000
|
||||
? RTS
|
||||
}
|
||||
|
||||
// calling with with e.g. $1E will set $0000-$0fff to $E000-$EFFF in chrrom1
|
||||
asm inline void set_chr_bank0(byte a) {
|
||||
STA $B000
|
||||
STA $C000
|
||||
? RTS
|
||||
}
|
||||
|
||||
// calling with with e.g. $1E will set $1000-$1fff to $E000-$EFFF in chrrom1
|
||||
asm inline void set_chr_bank1(byte a) {
|
||||
STA $D000
|
||||
STA $E000
|
||||
? RTS
|
||||
}
|
||||
|
||||
// TODO: FD/FE latches
|
||||
|
||||
asm inline void set_vertical_mirroring() {
|
||||
LDA #0
|
||||
STA $F000
|
||||
? RTS
|
||||
}
|
||||
asm inline void set_horizontal_mirroring() {
|
||||
LDA #1
|
||||
STA $F000
|
||||
? RTS
|
||||
}
|
||||
|
||||
|
|
@ -1,7 +1,8 @@
|
|||
; a very simple NES cartridge format
|
||||
; uses mapper 0 and no bankswitching, so it's only good for very simple games
|
||||
; assumes CHRROM is at chrrom:$0000-$3fff and PRGROM is at prgrom:$8000-$ffff
|
||||
; assumes CHRROM is at chrrom:$0000-$1fff and PRGROM is at prgrom:$8000-$ffff
|
||||
; uses horizontal mirroring; to use vertical mirroring, change byte #6 of the header from 0 to 1
|
||||
; output file size: 40976 bytes
|
||||
|
||||
[compilation]
|
||||
arch=ricoh
|
||||
|
|
@ -21,11 +22,11 @@ segment_prgrom_start=$8000
|
|||
segment_prgrom_end=$ffff
|
||||
|
||||
segment_chrrom_start=$0000
|
||||
segment_chrrom_end=$3fff
|
||||
segment_chrrom_end=$1fff
|
||||
|
||||
[output]
|
||||
style=single
|
||||
format=$4E,$45,$53,$1A, 2,2,0,0, 0,0,0,0, 0,0,0,0, prgrom:$8000:$ffff, chrrom:$0000:$3fff
|
||||
format=$4E,$45,$53,$1A, 2,1,0,0, 0,0,0,0, 0,0,0,0, prgrom:$8000:$ffff, chrrom:$0000:$1fff
|
||||
extension=nes
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user