Questions tagged [integrated-circuits]

For questions about ICs, the less complicated chips that provide many useful functions that would otherwise require discrete logic consisting of a larger number of transistors, etc.

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14 votes
1 answer
656 views

Why does this Soviet floppy controller have two windows in the chip package?

This is a picture of the KR1818VG93, a Soviet clone of the WD1793 floppy controller. It was used in some Spectrum clones: (source) What are the two windows in the chip package for? They appear to ...
user1908704's user avatar
22 votes
3 answers
7k views

How could the Intel 4004 address 640 bytes if it was only 4-bit?

I am reading Computer Organization and Architecture, 10th ed. by William Stallings and I found this on page 26. where it says the addressable memory of 4004 is 640 bytes. But it appears that the ...
Noob_Guy's user avatar
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5 votes
2 answers
782 views

Identify PROM from diagram

Any idea what PROM is intended in this diagram is ? It is from the rational R1000 computer. Edit: Its not my project, I was trying to help the Danish data museum. They are making an emulator for this ...
Stefan's user avatar
  • 169
7 votes
1 answer
313 views

What hardware was used for Magic circa 1985?

Magic, which is described as a "smart" layout system for integrated circuits, was open-source and available by the end of 1983. As far as hardware and OS requirements, early documentation ...
Brian H's user avatar
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3 votes
4 answers
312 views

What connector for Atari 2600 Controller?

I am working on designing a 8 bit computer and I was considering adding support for a Atari 2600 controller. I know it uses a D-Sub9 connector, but is there anything special about it? What I mean is ...
benjamin black's user avatar
5 votes
2 answers
465 views

What are typical causes of IC failure in early microcomputers?

When troubleshooting older electronics, the usual culprits tend to be connections and capacitors. The "solid state" components, if they have failed, usually in the role of victim e.g. bad voltage ...
natevw's user avatar
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