Comments (2)
Two keys on the //e's keyboard are actually directly connected to the game I/0 connector's push-button input lines. These are the OPEN-APPLE and CLOSED-APPLE keys that flank the space bar. These two keys are connected to PB0 and PB1, respectively.
$C061 (49249) PB0 Status of push button 0 (bit 7)
$C062 (49250) PB1 Status of push button 1 (bit 7)
$C063 (49251) PB2 Status of push button 2 (bit 7)
100 IF PEEK<49249>>127 THEN PRINT "DOWN WE GO!"
200 IF PEEK<49249><128 THEN PRINT "BACK AGAIN!"
300 GOTO 100
from steve2.
$C064 (49252) GC0 Status of game controller 0 (bit 7)
$C065 (49253) GC1 Status of game controller 1 (bit 7)
$C066 (49254) GC2 Status of game controller 2 (bit 7)
$C067 (49255) GC3 Status of game controller 3 (bit 7)
$C070 (49264) GCRESET Reset the game controllers
When this timer is reset, by accessing GCRESET ($C070), bit 7 of each GC I/0 memory location becomes high (1) but will eventually become low (0) when the timer "times out," that is,
the period of time equal to the time constant for each of the four "RC" circuits has elapsed.
Maximum time constant for this circuit is 0.022 x 150,000 ohms
= 0.0033 second. That is, when the resistance is at its maximum, the time required for the 558 Timer to bring bit 7 of the GC I/0 memory location low (0) is about 3.3 milliseconds
PREAD ($FB1E) subroutine located in the system monitor; it checks for a timeout condition every 11 microseconds.) You should note, however, that the PDL functions assume that your input resistance is in the range 0-150K ohms. This translates to a time constant that ranges from 0 to about 2.8 milliseconds and to PDL readings between 0 and 255. (Remember that the PDL subroutine's counter increments every 11 microseconds until the timer has timed out. This means that the maximum allowable time constant is 255* 11 microseconds, or 2.8 milliseconds.) If the upper limit of the resistance is higher than
150K ohms, then there will be a "dead area" where the resistance may change but the value calculated stays at 255; if it is lower, then the highest PDL value that can be generated will be less than 255.
from steve2.
Related Issues (17)
- Add Support for the DSK/DO Disk Image Format HOT 2
- Add Support for the PO Disk Image Format
- Add Support for 2IMG Disk Image Format
- Add Support for the Nibble (NDO/NIB) Disk Image Format
- Add Write Support fro WOZ 1 & 2
- Make WOZ 1 & 2 Support Stable, Support Copy Protected Games
- UI Overhaul
- Configurable Virtual Machine
- Add Volume Control
- Add Speaker Softness Control
- Mock Stereo
- Joystick / Paddle Emulation Options
- Unable to launch: NSInternalInconsistencyException
- Oregon Trail disk change
- Crash due to EXC_BAD_ACCESS HOT 2
- The Text display is very dimm
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from steve2.