Atari 400 Manuals

ATARI® PERSONAL COMPUTER SYSTEM • HARDWARE MANUAL ATAR I® A Warner Communications Company ~

1 Installation Instructions Atari 400 48/52 KB RAM Card Date: 2018 May 18, version 1.3 Author: Jürgen van Radecke (tfhh) Introduction Hi! Thank you for your purchase of an Atari 400 48/52 KB RAM card. I hope you enjoy this piece of hardware for our beloved Atari 8-bit computer systems � The Atari 400 48/52 KB RAM card is a replacement for the genuine, made-by-Atari CO61553 add-on card. This one was only offered by Atari Service facilities and uses 8 pieces of 4164 DRAM (= 64 KB total) and some TTL chips of the 74s series. Of course the upper 16 KB of 64 KB RAM can´t be used. The advantages of my card comparing to the original card are: • Uses SRAM instead of DRAM (reducing power consumption, need just +5V, smaller PCB) • Enables the usage of a very common “little memory expansion” up to 52 KB using the former unused area between $C000 and $CFFF • Enables the usage of up to 4 different operating systems installed on an industry standard EPROM instead of the special Atari mask-ROMs found on the 400 mainboard • Enables the usage of an operating system which uses the former unused area of $C000-$CFFF without modifications to the Atari 400 mainboard Please read the whole manual completely at least once, even if you´re a professional. The installation of the Atari 400 48/52 KB RAM card is very easy and only two wires must be soldered. These wires are needed for detecting an inserted cartridge – otherwise the computer will crash if a cart is inserted. The Atari 400 48/52 KB RAM card works fine in any Atari 400 computer using PAL or NTSC. Please check the parts included in the kit: • The Atari 400 48/52 KB RAM card, populated with a 27C256 EPROM • One ready-to-use crimped connection ribbon cable with 16 pin IDC header and DIL adapter All installation instructions are suitable for PAL or NTSC systems. The default settings of the jumpers on the Atari 400 48/52 KB RAM card are: • 48 KB RAM mode • Operating system chips on the 400 mainboard is used

iillllill ••• THE ATARI@410 M PROGRAM RECORDER OWNER'S GUIDE )I~ ATARI@ A Warner Communications Company ~

"HE BASIC COMPUTER'M OWNER'S GUIDE ..

ATARI%oo/8o ATARI' HOME COMPUTER SYSTEM HARDWARE MANUAL /t\ ATAR l' ^,."", -.mm 6rcre c.mpa^y o