ATM18 BASIC Computer

ATM18 simulates vintage home computers

Published in issue 11/2009 on page 28

The constantly escalating processor power of today’s PCs makes it a doddle to simulate another computer in software without the user even noticing any difference. Our ATM18 is a feeble performer by comparison but it still does a fine job if all you need is a small BASIC computer. So cast aside all longings for stylish graphics and lavish sound capabilities and get back to basics with this fabulous retro machine. Not that it skimps on essentials though; it features a serial interface, an EEPROM connection for saving programs and a couple of I/O lines. Everything you need in fact!

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Products

Components

Resistors
R1–R4 = 2.2kOhm
R5 = 1kOhm
R6 = 470Ohm
R7 = 5.6kOhm
Capacitors
C1–C4 = 100nF (SMD 0805)
Semiconductors
IC1 = 24C16
Miscellaneous
K1 = 6-way mini-DIN socket (female), PCB mount
K2,K3 = Cinch socket, PCB mount
K9 = 7-way SIL pinheader, lead pitch 0.1” (2.54mm)
K10,K12 = 9-way SIL pinheader, lead pitch 0.1” (2.54mm)
K11 = 5-way SIL pinheader, lead pitch 0.1” (2.54mm)
K4 = 6-way SIL socket strip, lead pitch 0.1” (2.54mm)
K5 = 6-way SIL socket strip, right angled, lead pitch 0.1” (2.54mm)
JP1 = 2-way pinheader with jumper
PCB # 090159-1, artwork download at [1]
Project source code und hex files, free download # 090159-11