tobiasvl / drom Goto Github PK
View Code? Open in Web Editor NEWDRÖM: DREAM 6800 emulator in LÖVE
Home Page: https://tobiasvl.github.io/tags/#dream-6800
License: MIT License
DRÖM: DREAM 6800 emulator in LÖVE
Home Page: https://tobiasvl.github.io/tags/#dream-6800
License: MIT License
PIA A at $8020
Current mapping assumes QWERTY
Right now, the main loop runs the CPU at 1 MHz, and draws to the screen at 50 Hz.
Instead, the VDG should be emulated. It should request an interrupt from the CPU and then draw the screen (using DMA).
The EPROM should be mirrored all the way up to $FFFF
(which is the actual location of the interrupt vectors).
Dreamer issue 3
Uses PIA B (extended IO)
Probably best to use an INI file since that's what imgui uses...
Replaces the on-board RAM (?) and adds
The release apparently has a bug: It crashes when attempting to load Dream Invaders.
Not sure why, since it works on master.
Fall back to just display and keyboard input
Instead of a WAV file: https://love2d.org/forums/viewtopic.php?f=4&t=88260
I thought this was caused by #11, but apparently not.
Some of the aliens experience graphical glitches.
Use LÖVE console?
Uses PIA B (extended IO)
Dreamsoft 1
After loading Dream Invaders from $0200
to $06FF
, and then loading the following checksum program from the Dream Invaders manual afterwards:
CPU.memory[0x700] = 0xCE
CPU.memory[0x701] = 0x02
CPU.memory[0x702] = 0x00
CPU.memory[0x703] = 0x4F
CPU.memory[0x704] = 0xE6
CPU.memory[0x705] = 0x00
CPU.memory[0x706] = 0x1B
CPU.memory[0x707] = 0x08
CPU.memory[0x708] = 0x8C
CPU.memory[0x709] = 0x07
CPU.memory[0x70A] = 0x00
CPU.memory[0x70B] = 0x26
CPU.memory[0x70C] = 0xF7
CPU.memory[0x70D] = 0x97
CPU.memory[0x70E] = 0xFF
CPU.memory[0x70F] = 0x7E
CPU.memory[0x710] = 0xC3
CPU.memory[0x711] = 0x60
The checksum at location $00FF
will sometimes be $AA
(the correct sum) and sometimes $83
.
Make a debug object that can access all components.
One special case for the address bus: It should not acknowledge the PIA's IRQ when reading off the PIA's data pins.
Consider using a CRT fade out effect to mitigate flicker
The TIME and TONE variables in CHIPOS are not properly decremented in some cases. When?
This is the cause of several current bugs:
There's way too little separation between parts right now. memory
shouldn't belong to the cpu
, and I need somewhere to store stuff like the number of cycles (right now it's a global…).
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