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56 votes

How did the Atari 2600 achieve a resolution of 160 x 192 pixels with only 128 bytes of memory?

The 2600 didn’t have a frame buffer. Instead, programs running on it had to draw the picture on the screen pretty much in real time. This actually had some advantages on a low-cost system. Each line ...
Stephen Kitt's user avatar
37 votes
Accepted

How did the Atari 2600 achieve a resolution of 160 x 192 pixels with only 128 bytes of memory?

According to wikipedia, the Atari 2600 had a resolution of 160 x 192 pixels. had it been monochrome, it would had needed 160*192 = 30,720 bits of video RAM, or 3,840 bytes. Even more taking colour ...
Raffzahn's user avatar
  • 224k
21 votes

Is it possible to raise the frequency of command input to the processor in this way?

You can take two identical RAM chips and run them by changing the frequency in the clock signal in one of chip. Pick up such a shift that. The 1st chip is being recharged, the 2nd chip is giving a ...
Wayne Conrad's user avatar
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17 votes

How did the Atari 2600 achieve a resolution of 160 x 192 pixels with only 128 bytes of memory?

The Atari VCS (it only became the Atari 2600, when the 5200 became a thing) is somewhat peculiar, as its video and audio chip, the "Television Interface Adapter", better known as TIA, ...
masswerk's user avatar
  • 406
13 votes

Is it possible to raise the frequency of command input to the processor in this way?

In the 70's and 80's RAM chips worked at a lower frequency than the CPU. That is, the processor worked at a frequency higher than the RAM. Not really. At least with microprocessors, RAM was usually ...
Raffzahn's user avatar
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11 votes
Accepted

Why doesn't the Acorn Electron use fast page mode?

This diagram comes from page 7 of the Electron service manual: As you can see, both CPU and VDU accesses involve a single RAS and two CASs. It is therefore using page mode.
Tommy's user avatar
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10 votes
Accepted

Did any 8-bit computers use 16kx4 RAM chips?

Quite a lot - well, not many different, as those chips came at a time when computers with only 16 KiB as base memory - and that's where 4416 would have been a cost saver - were already on the way out. ...
Raffzahn's user avatar
  • 224k
9 votes

How did the Atari 2600 achieve a resolution of 160 x 192 pixels with only 128 bytes of memory?

It seems you think that there is a frame buffer for a full video screen. And that the CPU draws stuff into the frame buffer and some video chip reads out the frame buffer and sends out as video. But ...
Justme's user avatar
  • 32.9k
7 votes
Accepted

Could the N64 have supported more than 8MB of RAM

In theory, yes it could. The RDRAM Interface (RI) inside the Reality Coprocessor translates accesses to the first 63 MiB of address space into RDRAM accesses, and provides enough access to RDRAM ...
Simon Farnsworth's user avatar
7 votes
Accepted

Did the Vic-20 save money using static RAM?

Interfacing static RAM and ROM to an 6502-type processor is "nearly free". You just wire address and data lines directly, the address decoding circuit is simple. Nothing else is needed. On ...
Michael Karcher's user avatar
6 votes

Why doesn't the Acorn Electron use fast page mode?

Is there some technical reason this would not work, or am I misunderstanding the situation? Both. First of all, it already uses PM when running at 1 MHz. Second it's basically a 2 MHz system with the ...
Raffzahn's user avatar
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5 votes

Is it possible to raise the frequency of command input to the processor in this way?

It is possible, was done, and is still done. While interleaved memory could be useful in early systems to speed up memory bandwidth, you are still running into a problem where the system needs to wait ...
Justme's user avatar
  • 32.9k
1 vote

Why doesn't the Acorn Electron use fast page mode?

The short answer is; based on the used RAS and CAS waveforms, it already uses page mode for accessing a single byte with two concecutive page mode cycles. The RAS goes low once to open a row address ...
Justme's user avatar
  • 32.9k

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