Articles tagged “CHIP-8”
ATmega644P CHIP-8/SCHIP interpreter
In an attempt to solve the screen resolution problem issue I've bought a very cheap 320×240 pixel graphical LCD – a PG320240H-P9 on eBay for $24. Part of the reason for its cheapness may be down to its the lack of a controller; you need to constantly refresh the LCD with pixel data yourself (easier to use modules have integrated controllers that refresh the display for you from some on-board RAM). If I manage to get it working I'll have a 128×64 pixel graphical LCD going spare – finding a use for it could make an interesting project.
Fixed and scaled CHIP-8/SCHIP interpreter
The CHIP-8/SCHIP interpreter now seems happy enough to run games, though the lack of settings to control how fast or slow they run makes things rather interesting. First of all, I've hacked together a painfully simple read-only file system. Each file is prefixed with a 13-byte header; 8 bytes for the filename (padded with spaces), 3 bytes for the extension (padded with spaces) and two bytes for the file size. The above file listing can be generated by typing *. at the BASIC prompt. I've written a new sprite drawing routine that scales sprites up to double size when in CHIP-8 mode; this allows CHIP-8 games to fill the entire screen.
64KB RAM and a CHIP-8/SCHIP interpreter
The only major hardware modification since last time is the addition of another 32KB SRAM. Click to toggle labels This appears as two 16KB pages in the $4000..$7FFF slot. Currently only the first page is used for OS variables and scratch space, freeing up the upper 32KB entirely for BBC BASIC's use. One other minor hardware addition is support for a dual-coloured LED on the control port. This LED will be used to signify file access - reads by a green LED and writes by a red LED. As such I haven't implemented a proper file system, but typing SAVE "FILE" or LOAD "FILE" at the prompt will transfer data between the Z80 RAM and a 24LC256 32KB EEPROM.
CHIP-8/SCHIP
It's not as if I didn't already have an excess of projects, but anyway... Vinegar - CHIP-8/SCHIP interpreter for the TI-83 (+) The binaries are here. I've tested them fairly extensively on my TI-83 Plus, but be warned that (as it's beta) they might cause odd crashes. Back up any important files!