The Atari XEP80 interface connects to joystick port 1 or 2 on the Atari computer and provides the system with:
- An 80-column Video Display Controller with phono output jack, carrying a monochrome composite video signal which can be either 60Hz (NTSC compatible) or 50Hz (PAL/SECAM compatible), selectable in software. - A Parallel Printer Port (Centronics output interface)
Note that the XEP80 does not include provision for audio.
VIDEO DISPLAY CONTROLLER The XEP80 video hardware generates an 80 column by 25 line text display through a video connector/cable plugged into a separately purchased monitor. The monitor can be any Composite Video input type, although for the best display a monochrome is strongly advised.
Internally, the XEP80 is a 256 character wide by 25 line high storage device with an 80 column wide display window. Characters may be placed anywhere within the device independent of the window location. The window may be scrolled across the 256 column wide field.
Optionally, the XEP80 may be placed into Pixel Graphics mode. This mode supports a bit mapped (pixel) screen of 320 dots (40 bytes) horizontal by 200 dots (lines) vertical. The output window displayed is approximately half the size of the text window.
The XEP80's composite video signal contains more horizontal scan lines per field than are used in NTSC or PAL/SECAM color broadcast, composite video, or Y/C video (S-video) signals. The XEP80 outputs 250 scan lines of video per field for the 60Hz signal compared to the NTSC standard of 243, or 300 scan lines of video for the 50Hz signal compared to the PAL standard of 288. Thus the XEP80's output was ideal for high-resolution CRT-based monochrome composite video monitors of the time, but settings on color televisions and monitors must typically be adjusted, if possible, in order for the entire video output signal to be viewable on the screen.
PARALLEL PORT The XEP80 supports a functional subset of the Centronics or PC parallel printer interface (standards introduced elsewhere in this FAQ list), using the IBM PC standard (1981) connector. Note that the Atari Operating System resident P: device handler does not support a printer attached via joystick port, so a substitute P: handler must be installed in RAM in order for Atari software to recognize the XEP80 parallel port for printing. 13 1 o o o o o o o o o o o o o DB-25 Socket - female o o o o o o o o o o o o 25 14 1. /Strobe 11. Busy 2-9. Parallel Data 12-17. Not Used 10. Not Used 18-25. Ground
SOFTWARE The XEP80 Handler and Relocator is provided on diskette in the form of a DOS binary file named AUTORUN.SYS. This file is automatically loaded into memory and initialized by the DOS at boot (power on) time. Contents of the XEP80 Boot Disk: (DX5087) DOS.SYS DOS 2.5 File Management Subsystem (FMS) DUP.SYS DOS 2.5 Disk Utility Package (DUP) AUTORUN.SYS XEP80 Handler and Relocator. Substitute versions for three OS-resident device handlers: - S: Display Handler - E: Screen Editor Designed to be compatible with the standard E: device but for the XEP80 80-column screen display. - P: Printer. Default configuration supports 8 different printer devices: P1: XEP80 parallel port P2: 850 Interface Module parallel port (e.g., Atari 825) P3: 1025 Printer P4: 1020 Color Plotter P5: 1027 Printer P6: 1029 Printer P7: XMM801 Printer P8: XDM121 Printer The handler interprets P: (no device number) to mean, P1: RELOC.SRC Relocater in assembly source XEP80HAN.SRC Handler in assembly source DEMO80.BAS Demonstrates overall XEP80 features MAKER.BAS Program to generate an AUTORUN.SYS from a custom-made Handler ATRIBUTE.BAS Demonstrates special text features WINDOW.BAS Demonstrates the 256-character wide window EIGHTY.BAS Displays a spreadsheet-like grid using the full XEP80 display GRAPHICS.BAS Demonstrates graphics capability by drawing a sphere on screen PRINTER.BAS Program to revise the default printer port configuration XEP80.DOC Product Specification For XEP80 hardware and software
Hold down [Shift] while loading the XEP80 Handler and Relocator (AUTORUN.SYS) to load the P: handler but not the S: and E: handlers (use the XEP80 for its parallel printer port only).
The key engineer/designer of the XEP80 was Jose Valdes at Atari. Lane Winner was software developer for the XEP80 at Atari. The XEP80 was made in Taiwan.
The XEP80 draws 400mA of current from an external power supply. Use a power supply that delivers 500mA 9V DC (center positive). Shipped with Atari C016353 or C018084. |