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Questions tagged [architecture]

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3
votes
2answers
239 views

Can S-100 cards attach to the ZX machines?

S-100 was, as I understand, a very popular way to connect various computer equipment together in the past. Also, from what I understand, S-100 closely matches the same signals as the Intel 8080, as ...
2
votes
1answer
398 views

How does the SNES (Super Nintendo) calculate the address of a character?

The SNES has a PPU (Picture Processing Unit) which comprises VRAM, OAM (Object Attribute Memory), and CGRAM (Color Graphics/Palette RAM). These are used to represent tiles, tile maps; attributes for ...
10
votes
2answers
619 views

What is the history of the PDP-11 MARK instruction?

The PDP-11 MARK instruction was intended to be used as part of the standard PDP-11 subroutine return convention. MARK facilitated the stack clean up procedures involved in subroutine exit. To use it, ...
6
votes
2answers
2k views

Was the IBM 5100 ever used for codebreaking?

There's a rumor that there's something embedded in the IBM 5100 which makes it useful for codebreaking. What is the legitimacy of that claim?
9
votes
1answer
278 views

Can we express the instructions to the Analytical Engine in terms of assembler or machine code?

On a recent trip to the London Science Museum I saw Babbage’s Analytical Engine. Apparently this had an ALU (or equivalent). I can build an ALU out of logic gates but I can’t conceptualise how to do ...
8
votes
3answers
232 views

What was the value of the HP/1000 repeated indirection capability?

The HP/1000 was considered like a 16-bit "expansion" of the 12-bit DEC PDP-8.  Its addressing mode for loads and stores similarly used pages, base page and current page, and allowed for ...
6
votes
2answers
243 views

Did any pre-microprocessor CPUs have a clock near the toggle speed of the logic ICs used?

This question is NOT about single chip CPUs, but such that were built from many SSI/MSI logic ICs or using a bitslice configuration. A 74F... or 74S... type TTL gate or flipflop, if you provide them ...
11
votes
3answers
1k views

What was the first CPU with exposed pipeline?

Quoting from Programming for Performance exercise: early versions of the MIPS processor had an "exposed pipeline" (that is, the assembly language programmer needed to know the latencies of ...