Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
06732 Gameplay Minor Always Oct 25, 2017, 03:38 Oct 25, 2017, 10:18
Tester mr_me View Status Public Platform MAME (Unofficial Binary)
Assigned To Resolution Bugs That Aren't Bugs OS Windows Vista/7/8 (64-bit)
Status [?] Resolved Driver ti99_4x.cpp
Version 0.188 Fixed in Version Build 64-bit
Summary MESS-specific 06732: ti99_4a: Joystick "up" direction does not work
Description All joystick functions work except up (ie. left, right, down, fire). I tested using a usb game controller and the keyboard up arrow. I tried remapping the up function to another key and that didn't work
Steps To Reproduce Start a game and try playing it.
I tried Parsec and Donkey Kong.
Additional Information
Regression Version
Affected Sets / Systems ti99_4a
Attached Files
There are no relationship linked to this issue.
User avatar
Oct 25, 2017, 09:08
Are you using the TI-99/4A?
According to the driver:
The hardware bug of the TI-99/4A: you have to release the Alphalock key when using joysticks. This is a maldesign of the board: When none of the other keyboard lines are selected the depressed Alphalock key pulls up the /INT7 line which is also used for joystick up. The joystick switch then fails to lower the line enough to make the TMS9901 sense the low level.
User avatar
Oct 25, 2017, 10:18
This is a confirmed BTANB.
Having owned a TI 99-4a for a long time I can attest to the fact about a seemingly malfunctioning joystick up due to Alpha Lock key.