dirkwhoffmann
commented
5 months ago The tests have been replaced by better ones: interfere1 to interfere6 and interfere1b to interfere6b in folder Denise/Sprites/sprma (vAmigaTS repo).
Together, the tests suggest the following:
- Writes to
SPRxPOSandSPRxCTLare delayed by 2 DMA cycles. - A DMA write to
SPRxPOSandSPRxCTLis dropped whenSPRxCTLwas written one cycle earlier.
The latest version on the dev branch passes all 12 interfere tests.
Likely related to #715.
The test draws all seven sprites and utilizes the Copper to write into
SPRxCTLaround the same time the register is written by DMA.A500 ECS:
Latest vAmiga:
The error might be due to dropped register writes on the real machine.
Next step:
The
sprdroptest folder already contains tests for verifying the correct write-dropping behaviour forSPRxPTLandSPRxPTH. Write similar tests forSPRxPOSandSPRxCTL.