GP0(E1h) Draw Mode
Checks which bits of GP0(E1h) reach GPUSTAT and how textured polygons change them.
| Machine | SCPH-5501 |
|---|---|
| Program | gpu/gp0-e1 (ps1-tests) |
Overview
The program writes zeros and ones to the draw mode command GP0(E1h) and reads the result in GPUSTAT. It then draws textured polygons, whose texpage attribute also sets the draw mode, and checks the texture disable bit with GP1(09h) allowing and forbidding it.1
Results
The SCPH-5501 passed all 10 checks in every run.2
| Check | Result |
|---|---|
| Write zeros to E1h | pass |
| Write ones to E1h | pass |
| Write ones with texture disable | pass |
| Textured polygons set the texpage bits | pass |
| Textured polygons with texture disable | pass |
| Textured polygons leave the other bits alone | pass |
| Texture disable bit ignored when not allowed | pass |
| Texture disable bit written when allowed | pass |
| Clearing the allow bit keeps the disable bit | pass |
| Clearing the allow bit clears the disable bit after a write | pass |
Runs
25 September 2026
===== 13 GE1 GPU GP0 E1 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
gpu/gp0-e1
pass - testWriteZerosToE1
pass - testWriteOnesToE1
pass - testWriteOnesToE1WithTextureDisable
pass - testTexturedPolygons
pass - testTexturedPolygonsTextureDisable
pass - testTexturedPolygonsDoesNotChangeOtherBits
pass - testTextureDisableBitIsIgnoredWhenNotAllowed
pass - testTextureDisableBitIsWrittenWhenAllowed
pass - testUnsetAllowTextureDisablePreservesBit
pass - testUnsetAllowTextureDisableClearsBitAfterWrite
Done.
27 September 2026
===== 13 GE1 GPU GP0 E1 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
gpu/gp0-e1
pass - testWriteZerosToE1
pass - testWriteOnesToE1
pass - testWriteOnesToE1WithTextureDisable
pass - testTexturedPolygons
pass - testTexturedPolygonsTextureDisable
pass - testTexturedPolygonsDoesNotChangeOtherBits
pass - testTextureDisableBitIsIgnoredWhenNotAllowed
pass - testTextureDisableBitIsWrittenWhenAllowed
pass - testUnsetAllowTextureDisablePreservesBit
pass - testUnsetAllowTextureDisableClearsBitAfterWrite
Done.
27 September 2026 run 2
===== 13 GE1 GPU GP0 E1 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
gpu/gp0-e1
pass - testWriteZerosToE1
pass - testWriteOnesToE1
pass - testWriteOnesToE1WithTextureDisable
pass - testTexturedPolygons
pass - testTexturedPolygonsTextureDisable
pass - testTexturedPolygonsDoesNotChangeOtherBits
pass - testTextureDisableBitIsIgnoredWhenNotAllowed
pass - testTextureDisableBitIsWrittenWhenAllowed
pass - testUnsetAllowTextureDisablePreservesBit
pass - testUnsetAllowTextureDisableClearsBitAfterWrite
Done.
27 September 2026 run 3
===== 13 GE1 GPU GP0 E1 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
gpu/gp0-e1
pass - testWriteZerosToE1
pass - testWriteOnesToE1
pass - testWriteOnesToE1WithTextureDisable
pass - testTexturedPolygons
pass - testTexturedPolygonsTextureDisable
pass - testTexturedPolygonsDoesNotChangeOtherBits
pass - testTextureDisableBitIsIgnoredWhenNotAllowed
pass - testTextureDisableBitIsWrittenWhenAllowed
pass - testUnsetAllowTextureDisablePreservesBit
pass - testUnsetAllowTextureDisableClearsBitAfterWrite
Done.
27 September 2026 run 4
===== 13 GE1 GPU GP0 E1 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
gpu/gp0-e1
pass - testWriteZerosToE1
pass - testWriteOnesToE1
pass - testWriteOnesToE1WithTextureDisable
pass - testTexturedPolygons
pass - testTexturedPolygonsTextureDisable
pass - testTexturedPolygonsDoesNotChangeOtherBits
pass - testTextureDisableBitIsIgnoredWhenNotAllowed
pass - testTextureDisableBitIsWrittenWhenAllowed
pass - testUnsetAllowTextureDisablePreservesBit
pass - testUnsetAllowTextureDisableClearsBitAfterWrite
Done.
28 September 2026
===== 13 GE1 GPU GP0 E1 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
gpu/gp0-e1
pass - testWriteZerosToE1
pass - testWriteOnesToE1
pass - testWriteOnesToE1WithTextureDisable
pass - testTexturedPolygons
pass - testTexturedPolygonsTextureDisable
pass - testTexturedPolygonsDoesNotChangeOtherBits
pass - testTextureDisableBitIsIgnoredWhenNotAllowed
pass - testTextureDisableBitIsWrittenWhenAllowed
pass - testUnsetAllowTextureDisablePreservesBit
pass - testUnsetAllowTextureDisableClearsBitAfterWrite
Done.
References
-
^ ps1-tests, gpu/gp0-e1. https://github.com/JaCzekanski/ps1-tests.
-
^ SCPH-5501 output: main/13GE1.txt and the files beside it, with the other runs listed under Runs.
Categories: Hardware tests