#283 Implement VT02/VT03 by jpjonte · Pull Request #435 · jpjonte/NESd

jpjonte · 2026-09-05T12:44:08Z

Closes #328, #329, #330, #331, #332, #333, #334.

jpjonte added 30 commits September 5, 2026 14:42

#328 Serialize mapper ids in 16 bits

2d1f031

#328 Extract the A12 edge detector from MMC3

bd1e602

#328 Move PPU register decoding into the PPU

af4af76

#328 Implement the VT02+ timer interrupt

95dd3e4

#328 Implement VT02+ I/O ports and RS232 status

ccb5343

#328 Implement VT03 extended DMA

25f4b83

#328 Skip in-progress mappers in update_game_counts

f094e8a

#329 Implement VT02+ PRG-ROM bankswitching

da17b26

#328 Read the mapper id envelope through MapperState.peekId

e541893

#330 Stop faking a CHR-ROM for CHR-less images

d855128

#330 Implement VT02+ CHR-ROM bankswitching

5aabd7c

#331 Move clockA12 into the VT02 test harness

2348faf

#331 Match the VT02+ timer to the MMC3 IRQ counter

9348622

#331 Select the nametable arrangement with 0x4106

0961578

#331 Forward MMC3 register writes to the VT02+ registers

d7cf3b5

#332 Add the 2bpp -> 4bpp pattern address transforms

281ca8c

#332 Add the 4bpp PPU pattern mapping table

749cb77

#332 Map the 4bpp pattern space from the VT02 registers

d220484

#332 Extend the palette to the VT03 128-entry space

daf0f8d

#332 Fetch and render 4bpp backgrounds

7a4c656

#332 Fetch and render 4bpp sprites

78dd9a9

#144 Scramble the VT02 registers per submapper

caa10f4

#144 Only update PPU address for VT02 while rendering is on

93d47a8

#144 List VT03 OneBus (mapper 256) as supported

64a992c

#333 Extract a shared 4bpp test harness

8576395

#333 Cover 4bpp flips, 8x16 sprites and 0x3f90

ff17614

#333 Add the EVA pattern space to Mapper and PPU

c3ba9c7

#333 Install the EVA bank tables from the VT02 registers

983b1f0

#333 Push the extension video-mode state to the PPU

7fb6104

#333 Fetch backgrounds through the extended video address

86d027c

jpjonte added 10 commits September 5, 2026 14:42

#333 Fetch sprites through the extended video address

11a18c6

#333 Render 16px width sprites

c790ad7

#333 Return raw OAM attribute bits on VT mappers

6205bd2

#333 Route 0x2007 pattern reads through VRWB

e4714a0

#333 Add test for PPU A12

e4d1c06

#334 Add the VT03+ 12-bit palette decode

f577178

#334 Stop dropping palette writes to $3FFF

96ec488

#334 Decode COLCOMP 12-bit colors

f7a83cd

#332 Fix: Move 4bpp planes 2/3 to palette index bits 5-6

bb50897

#283 Require 4 low cyles before an A12 rise counts

04f34f2

jpjonte enabled auto-merge September 5, 2026 12:44

jpjonte merged commit 1c366e1 into main Sep 5, 2026
30 checks passed

jpjonte deleted the feature/283-vtxx branch September 5, 2026 12:59

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#283 Implement VT02/VT03 - #435

#283 Implement VT02/VT03#435
jpjonte merged 40 commits into
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jpjonte commented Sep 5, 2026

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jpjonte commented Sep 5, 2026

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