clobber
56420c3a12
Includes:
- Partial Expansion Module (XM) support
- XRAM
- XPokey (limited to single Pokey)
- Added support for cartridges with sizes greater than 144k
- Additional bank switching modes and cartridge types
- Multiple bank switching fixes
- Reworked cartridge header detection
- Now properly detects bank switching, RAM, etc.
- Detects Expansion Module (XM)
- Detects High score cartridge
- Detects Pokey at $0450
- Cartridge database
- Added several new cartridge properties
- Pokey at $0450
- Default difficulty switch settings
- Expansion Module (XM) enabled/disabled
- High score cartridge enabled/disabled
- Database content
- Fixed incorrect controller settings for Sirius, Crossbow,
and Alien Brigade
- Added many homebrew cartridges
- Fixed issue occurring when Kangaroo and Holey were enabled (caused
background to be displayed, resulting in large black squares)
Missing:
- High Score Cartridge support
82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
/*
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Memory map:
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POKEY1 $0450 $045F 16 bytes
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POKEY2* $0460 $046F 16 bytes
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XCTRL $0470 $047F 1 byte
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RAM $4000 $7FFF 16384 bytes
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XCTRL Bit Description
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+-------------------------------+
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| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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+-------------------------------+
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| | | | | | | |
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| | | | | | | +-- Bank select bit 0 \
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| | | | | | +------ Bank select bit 1 | Totally 128 KByte in 16 KByte banks
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| | | | | +---------- Bank select bit 3 /
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| | | | +-------------- Enable memory bit (1 = Memory enabled, 0 after power on)
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| | | +------------------ Enable POKEY bit** (1 = POKEY enabled, 0 after power on)
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NA NA NA = Not Available or Not Used
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* = Can be mounted piggy back on the first POKEY. Description how to do this will come when i have tried it out.
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** This bit controls both POKEY chip select signals.
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The mapping is totally non compatible with pretty much everything.
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There is a bank select latch located at $0470 and the POKEY is located at $0450
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(There's also a chip select output ($0460) on the PLD which alows you to simply piggy back a second POKEY).
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Since the PLD is reconfigurable I could map the POKEY (or the RAM for that matter) to pretty much anything
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if you wanted to. However since the PLD is soldered under the POKEY this needs to be configured before delivery.
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*/
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#include <string.h>
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#include "ExpansionModule.h"
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byte xm_ram[XM_RAM_SIZE] = {0};
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byte xm_reg = 0;
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byte xm_bank = 0;
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bool xm_pokey_enabled = false;
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bool xm_mem_enabled = false;
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void xm_Reset() {
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memset(xm_ram, 0, XM_RAM_SIZE);
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xm_bank = 0;
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xm_reg = 0;
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xm_pokey_enabled = false;
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xm_mem_enabled = false;
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}
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byte xm_Read(word address) {
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if (xm_pokey_enabled && (address >= 0x0450 && address < 0x0460)) {
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byte b = pokey_GetRegister(0x4000 + (address - 0x0450));
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return b;
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} else if (xm_pokey_enabled && (address >= 0x0460 && address < 0x0470)) {
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byte b = pokey_GetRegister(0x4000 + (address - 0x0460));
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return b;
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} else if (xm_mem_enabled && (address >= 0x4000 && address < 0x8000)) {
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byte b = xm_ram[(xm_bank * 0x4000) + (address - 0x4000)];
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return b;
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} else if (address >= 0x0470 && address < 0x0480) {
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// TODO: Should the value be returned?
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}
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return 0;
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}
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void xm_Write(word address, byte data) {
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if (xm_pokey_enabled && (address >= 0x0450 && address < 0x0460)) {
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pokey_SetRegister(0x4000 + (address - 0x0450), data);
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} else if (xm_pokey_enabled && (address >= 0x0460 && address < 0x0470)) {
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pokey_SetRegister(0x4000 + (address - 0x0460), data);
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} else if (xm_mem_enabled && (address >= 0x4000 && address < 0x8000)) {
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xm_ram[(xm_bank * 0x4000) + (address - 0x4000)] = data;
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} else if (address >= 0x0470 && address < 0x0480) {
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xm_reg = data;
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xm_bank = xm_reg & 7;
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xm_pokey_enabled = (xm_reg & 0x10) > 0;
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xm_mem_enabled = (xm_reg & 0x08) > 0;
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}
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}
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