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ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
02826 Known Issues/To-Do's Minor Always Jan 14, 2009, 21:58 Nov 16, 2018, 02:08
Tester chowell View Status Public Platform
Assigned To Resolution Fixed OS
Status [?] Resolved Driver mw8080bw.cpp
Version 0.129 Fixed in Version 0.174 Build
Fixed in Git Commit Github Pull Request #
Summary 02826: spcenctr: Dark bands on trench are too dark; they should be lighter than the background.
Description Looking at the code for Space Encounters in the MAME source (video/mw8080bw.c), the dark bands drawn on the trench are currently set to black, the same as the background color. This makes the far end of the trench appear to vary in height, which is clearly undesirable. (By the way, the relevant #defines are all misnamed PHANTOM2_*.)

The actual machine does not have this problem. This Flash video of one in action shows clearly that the dark bands are *not* black:

The brightness level of the bands seems to be determined by a resistor network visible on the right edge of the video board schematic in the Space Encounters manual, available here:

The schematic is on page 22 of the PDF (page 21 of the original manual).

Alas, I am not an electrical engineer and cannot trust my ability to determine the proper brightness levels from this schematic. Perhaps a MAME developer familiar with analog circuit networks can help. (I do realize that tracing the video circuit logic outputs is a task in itself.)
Steps To Reproduce
Additional Information
Github Commit
Flags Verified with Original, Noted in Source
Regression Version
Affected Sets / Systems spcenctr
Attached Files
There are no relationship linked to this issue.
User avatar
Jan 14, 2009, 22:59
Sorry, I hadn't noticed the following comment near the top of drivers/mw8080bw.c:

      Known issues/to-do's:
          * Space Encounters: verify trench colors

Just consider this bug as a follow-up on that.
User avatar
Senior Tester
Nov 13, 2018, 14:10
This was fixed in mame 0.174 by qwijibo