IAS computer

[bob]

You recall the IAS computer built that foundation we still rely on today. I studied its core setup years ago during my own training. You get how it stored programs right in memory alongside data. And that changed everything from earlier machines that needed rewiring. But the designers used forty bit words for all operations. Perhaps you wonder about the fetch cycle they invented first. I see it as a simple loop where instructions pull from the same spot as numbers. You notice the control unit directing the arithmetic part step by step. Or the way input came through paper tape readers back then. Also memory held just over four thousand locations at start.
I think the accumulator register handled most calculations without extra steps. You see why that made it faster than prior setups with separate storage. But the instruction format packed an operation code with an address in each word. And branches happened based on sign tests from results. Perhaps timing came from a clock that synced every phase. I recall the adder circuit doing both addition and subtraction in one go. You follow how output went to printers or tapes after processing. Also the design avoided any distinction between code and numbers in storage. But that led to self modifying programs which people tried early on. Or the overall layout influenced every later processor we know.
You notice the lack of interrupts in its original form. I find that made it straightforward yet limited for complex tasks. And the memory was magnetic wire or later core in upgrades. Perhaps you ask about the exact cycle times they achieved. I remember reports of around twenty five microseconds per addition. You see the parallel paths in the arithmetic unit speeding things up. But everything ran under a central sequencer that issued signals in order. Also input output stayed slow compared to internal speeds. Or the whole thing fit in a big room with many racks. I think its success came from proving the stored program idea worked in practice. You follow how universities copied the plans widely after that. But no fancy caching existed yet so access stayed uniform.
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