Hi, I'm trying to get the oam_read test to run on my NES emulator. To debug, I'm comparing my log with Nintendulator log. However, the Nintendulator log makes me question my understanding of OAM reading and writing.
Here's the nintendulator log snippet, extracted from line 51187 to 51230:At the 4th line from the bottom, the LDA $2004 returns E3 to the accumulator instead of the expected FF value, which was previously written to OAM[2] above.
Does anyone know what's happening here? Any help is appreciated. Thanks for reading
Here's the nintendulator log snippet, extracted from line 51187 to 51230:
Code:
E78A A9 00 LDA #$00 A:00 X:00 Y:00 P:A6 SP:FD PPU: 42,241 CYC:176318E78C 8D 00 20 STA $2000 = FF A:00 X:00 Y:00 P:26 SP:FD PPU: 48,241 CYC:176320E78F A9 00 LDA #$00 A:00 X:00 Y:00 P:26 SP:FD PPU: 60,241 CYC:176324E791 8D 01 20 STA $2001 = FF A:00 X:00 Y:00 P:26 SP:FD PPU: 66,241 CYC:176326E794 A2 00 LDX #$00 A:00 X:00 Y:00 P:26 SP:FD PPU: 78,241 CYC:176330E796 8E 03 20 STX $2003 = FF A:00 X:00 Y:00 P:26 SP:FD PPU: 84,241 CYC:176332E799 AD 04 20 LDA $2004 = FF A:00 X:00 Y:00 P:26 SP:FD PPU: 96,241 CYC:176336E79C 49 E3 EOR #$E3 A:FF X:00 Y:00 P:A4 SP:FD PPU:108,241 CYC:176340E79E 8E 03 20 STX $2003 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:114,241 CYC:176342E7A1 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:126,241 CYC:176346E7A4 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:138,241 CYC:176350E7A7 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:150,241 CYC:176354E7AA 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:162,241 CYC:176358E7AD 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:174,241 CYC:176362E7B0 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:186,241 CYC:176366E7B3 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:198,241 CYC:176370E7B6 8D 04 20 STA $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:210,241 CYC:176374E7B9 8E 03 20 STX $2003 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:222,241 CYC:176378E7BC 4D 04 20 EOR $2004 = FF A:1C X:00 Y:00 P:24 SP:FD PPU:234,241 CYC:176382E7BF 9D 25 02 STA $0225,X @ 0225 = 00 A:00 X:00 Y:00 P:26 SP:FD PPU:246,241 CYC:176386E7C2 E8 INX A:00 X:00 Y:00 P:26 SP:FD PPU:261,241 CYC:176391E7C3 D0 D1 BNE $E796 A:00 X:01 Y:00 P:24 SP:FD PPU:267,241 CYC:176393E796 8E 03 20 STX $2003 = FF A:00 X:01 Y:00 P:24 SP:FD PPU:276,241 CYC:176396E799 AD 04 20 LDA $2004 = FF A:00 X:01 Y:00 P:24 SP:FD PPU:288,241 CYC:176400E79C 49 E3 EOR #$E3 A:1C X:01 Y:00 P:24 SP:FD PPU:300,241 CYC:176404E79E 8E 03 20 STX $2003 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU:306,241 CYC:176406E7A1 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU:318,241 CYC:176410E7A4 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU:330,241 CYC:176414E7A7 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 1,242 CYC:176418E7AA 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 13,242 CYC:176422E7AD 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 25,242 CYC:176426E7B0 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 37,242 CYC:176430E7B3 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 49,242 CYC:176434E7B6 8D 04 20 STA $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 61,242 CYC:176438E7B9 8E 03 20 STX $2003 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 73,242 CYC:176442E7BC 4D 04 20 EOR $2004 = FF A:FF X:01 Y:00 P:A4 SP:FD PPU: 85,242 CYC:176446E7BF 9D 25 02 STA $0225,X @ 0226 = 00 A:00 X:01 Y:00 P:26 SP:FD PPU: 97,242 CYC:176450E7C2 E8 INX A:00 X:01 Y:00 P:26 SP:FD PPU:112,242 CYC:176455E7C3 D0 D1 BNE $E796 A:00 X:02 Y:00 P:24 SP:FD PPU:118,242 CYC:176457E796 8E 03 20 STX $2003 = FF A:00 X:02 Y:00 P:24 SP:FD PPU:127,242 CYC:176460E799 AD 04 20 LDA $2004 = FF A:00 X:02 Y:00 P:24 SP:FD PPU:139,242 CYC:176464E79C 49 E3 EOR #$E3 A:E3 X:02 Y:00 P:A4 SP:FD PPU:151,242 CYC:176468E79E 8E 03 20 STX $2003 = FF A:00 X:02 Y:00 P:26 SP:FD PPU:157,242 CYC:176470E7A1 8D 04 20 STA $2004 = FF A:00 X:02 Y:00 P:26 SP:FD PPU:169,242 CYC:176474Does anyone know what's happening here? Any help is appreciated. Thanks for reading
Statistics: Posted by minhmxc — Sat Sep 14, 2024 12:50 am — Replies 2 — Views 102
