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)|
|Version||0.188||Fixed in Version||Build||64-bit|
|Summary||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.
|Affected Sets / Systems||ti99_4a|
|There are no relationship linked to this issue.|
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.
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.