Comments (3)
frozen-signal
commented on July 28, 2024
Fixed several things in 47167a4, but the problem is still present.
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frozen-signal
commented on July 28, 2024
Testbenches confirms that the video scanner is correct, and the video address mux generates the correct addresses. The problem is possibly tied to RAM refresh timeouts.
See fd76e18
from apple_iie_mmu_iou.
frozen-signal
commented on July 28, 2024
This problem a problem with the multiplexed RAM address. Apple IIe's RAM need a /RAS hold time of ~25ns. With the current sources, it is close to 0ns.
A fix is underway.
Also changed the title of the issue.
from apple_iie_mmu_iou.
Related Issues (19)
- [IOU] At power-on, POC and RESET_N are not valid. HOT 1
- The computation of the line addresses is incorrect. HOT 1
- Fix the test IOU_TB_SCANNER_MUX HOT 1
- Garbage is displayed when a 64K/80COL card is present HOT 1
- Add a hardware implementation guide HOT 3
- Add Apple IIc features to the IOU
- Add Apple IIc features to the MMU
- HIRES images: rightmost part displayed on the left side, shifted down. HOT 3
- Document all timings requirements for the IOU and MMU
- RESET should not clear the ITEXT and MIX soft-switches. HOT 1
- At power-on, the video color burst is present.
- Check if RA_ENABLE_N need a hold delay HOT 1
- Some game cause the Apple IIe to hang HOT 2
- The Black Cauldron has some issues HOT 2
- Bring the signals timings closer to the ASICs HOT 1
- The MMU still seem to have timings issues when used with a RAMWorks III card HOT 1
- No familiar 'beep' on power-on
- RAMWORKS fails to recognize slow RAM in rows other than first. HOT 1
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