diff --git a/src/BizHawk.Client.Common/movie/PlatformFrameRates.cs b/src/BizHawk.Client.Common/movie/PlatformFrameRates.cs
index 1067b4e3c4..3abc65c152 100644
--- a/src/BizHawk.Client.Common/movie/PlatformFrameRates.cs
+++ b/src/BizHawk.Client.Common/movie/PlatformFrameRates.cs
@@ -25,8 +25,8 @@ namespace BizHawk.Client.Common
 			["SGB"] = 21477272.0 / (4 * 341 * 262 - 2), // 60.0988118623
 			["SGB_PAL"] = 21281370.0 / (4 * 341 * 312), // 50.0069789082
 			["BSX"] = 21477272.0 / (4 * 341 * 262 - 2), // 60.0988118623
-			["PCE"] = 7159090.90909090 / 455 / 263, // 59.8261054535
-			["PCECD"] = 7159090.90909090 / 455 / 263, // 59.8261054535
+			["PCE"] = 2250000.0 / 37609.0, // = 78750000 / 11 / 455 / 263 ≈ 59.8261054535
+			["PCECD"] = 2250000.0 / 37609.0, // = 78750000 / 11 / 455 / 263 ≈ 59.8261054535
 			["SMS"] = 3579545 / 262.0 / 228.0, // 59.9227434043
 			["SMS_PAL"] = 3546893 / 313.0 / 228.0, // 49.7014320946
 			["GG"] = 3579545 / 262.0 / 228.0, // 59.9227434043
@@ -51,13 +51,11 @@ namespace BizHawk.Client.Common
 
 			// while the number of scanlines per frame is software controlled and variable, we
 			// enforce exactly 262 (NTSC) 312 (PAL) per reference time frame
-			["A26"] = 315000000.0 / 88.0 / 262.0 / 228.0, // 59.922751013550531429197560173856
-
+			["A26"] = 1640625.0 / 27379.0, // = 315000000 / 88 / 262 / 228 ≈ 59.922751013550531429197560173856
+			["A78"] = 1640625.0 / 27379.0, // ditto
+			["Coleco"] = 1640625.0 / 27379.0, // ditto
 			// this pal clock ref is exact
-			["A26_PAL"] = 3546895.0 / 312.0 / 228.0, // 49.860759671614934772829509671615
-
-			["A78"] = 59.9227510135505,
-			["Coleco"] = 59.9227510135505,
+			["A26_PAL"] = 3546895.0 / 71136.0, // = 3546895 / 312 / 228 ≈ 49.860759671614934772829509671615
 
 #if true // according to https://github.com/TASEmulators/mednafen/blob/740d63996fc7cebffd39ee253a29ee434965db21/src/psx/gpu.cpp [failed verification—there are several expressions but none of them match these]
 			["PSX"] = 502813668.0 / 8388608.0, // 59.940060138702392578125
@@ -68,8 +66,8 @@ namespace BizHawk.Client.Common
 #endif
 
 			// according to https://github.com/TASEmulators/mednafen/blob/382ff1b8d293c9a862497706808cbb79b2cecbfb/src/ss/vdp2.cpp#L904-L907
-			["SAT"] = 8734090909.0 / 145852525, // = 1746818181.8 / 61 / 4 / 455 / ((263 + 262.5) / 2.0) ≈ 59.8830284837
-			["SAT_PAL"] = 62500.0 / 1251, // = 1734687500.0 / 61 / 4 / 455 / ((313 + 312.5) / 2.0) ≈ 49.9600319744
+			["SAT"] = 8734090909.0 / 145852525, // = 1746818181.8 / 61 / 4 / 455 / ((263 + 262.5) / 2.0) ≈ 59.883028483737256
+			["SAT_PAL"] = 62500.0 / 1251, // = 1734687500.0 / 61 / 4 / 455 / ((313 + 312.5) / 2.0) ≈ 49.960031974420467
 
 			["Doom"] = 35.0,
 
@@ -81,10 +79,10 @@ namespace BizHawk.Client.Common
 			["C64_NTSC"] = NTSCCarrier * 2 / 7 / 263 / 65,
 			["C64_NTSC_OLD"] = NTSCCarrier * 2 / 7 / 262 / 64,
 			["C64_DREAN"] = PALNCarrier * 2 / 7 / 312 / 65,
-			["INTV"] = 59.92,
+			["INTV"] = 1498.0 / 25.0, // = 59.92
 
-			["ZXSpectrum_PAL"] = 50.080128205,
-			["AmstradCPC_PAL"] = 50.08012820512821,	// = 1 / ((1024 * 312) / 16,000,000)
+			["ZXSpectrum_PAL"] = 15625.0 / 312.0, // = 3500000 / 224 / 312 ≈ 50.0801282051282051
+			["AmstradCPC_PAL"] = 15625.0 / 312.0, // ditto (progressive mode)
 
 			["UZE"] = 1125000.0 / 18733.0, // = 8 * 315000000 / 88 / 1820 / 262 ≈ 60.05444936742646666
 			["VEC"] = 50,