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puppydrum64
  • Member for 2 years, 6 months
  • Last seen more than a month ago
26 votes
7 answers
6k views

How did DOS games manage to have multiple background layers?

17 votes
3 answers
2k views

Why can't I invoke the next interrupt service by incrementing the AX register after calling the same interrupt?

17 votes
1 answer
3k views

How did Legend of Zelda: Oracle of Seasons/Ages know it was running on a Game Boy Advance?

15 votes
2 answers
2k views

How to use "AND," "OR," and "XOR" modes for VGA Drawing

9 votes
1 answer
2k views

Why does the Z80 JP (absolute) instruction always take 10 states to execute?

8 votes
1 answer
572 views

Is "scroll tearing" a symptom of scanline interrupts taking too long?

8 votes
1 answer
282 views

Using the (An)+ to Memory addressing mode when address register is pointed to ROM causes Sega Genesis DMA to fail

6 votes
2 answers
885 views

How can I detect signed integer overflow on the Game Boy?

6 votes
1 answer
281 views

Commodore 64 sound seems to freeze at a high pitch if executed too soon after startup

5 votes
1 answer
608 views

How to assign code to different PRG-ROM banks on an NES ROM using ca65/ld65

5 votes
1 answer
353 views

Can I use cartridge RAM for the stack pointer?

4 votes
0 answers
342 views

Game Boy interrupt handler crashes unless I jump to it indirectly

4 votes
2 answers
868 views

How to wait for vBlank on Commodore 64

3 votes
1 answer
152 views

Spontaneous movement and game crashes from active-low joystick routines [closed]

2 votes
2 answers
349 views

How to properly convert an active-low joystick routine to active-high

2 votes
1 answer
262 views

Timer B Interrupt occurs only once

1 vote
1 answer
270 views

Game assembled using RGBDS can't access cartridge RAM

1 vote
0 answers
121 views

Getting a loading seam to work with 2x2 metatiles

1 vote
1 answer
360 views

Can the window only be moved once per frame on the Game Boy?

1 vote
1 answer
325 views

How does RETN return from NMI on the Z80 in the event of nested NMI?