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  2. 8 bit microcomputers - Do I have to use an 8284 chip with the …

    Feb 1, 2018 · 10 I recently got the idea to start an 8088 system because I've been really interested in retro computing and the idea of a "breadboard computer" sounds very fun. From what I've read, every homebrew 8088 system requires the use of the 8284 clock generator chip in …

  3. What was the IBM PC cost saving for using the 8088 vs 8086?

    Apr 27, 2017 · The 8088 has an 8-bit data bus whereas the 8086 has a 16-bit data bus, so the 8088 is a 16-bit chip for these purposes. The IBM 5150 uses 64kx1 DRAM chips per its technical reference manual section 1-13. So when accessing anything in its 64kb of motherboard RAM, eight chips respond at once, each providing or receiving a single bit.

  4. How much did IBM save by limiting the PC to 4.77 MHz?

    Mar 11, 2020 · My understanding is the CPU clock speed on the Intel 8088 in the IBM PC was selected as 4.77 MHz to simplify the design of the system. This despite the 8088 coming in two versions - 5 MHz and 8 MHz.

  5. 8088 - How to keep the instruction prefetcher filled up ...

    Aug 31, 2018 · The 8088 and 8086 are microcoded CPUs, and need multiple cycles to execute each instruction. The fastest instructions take at least 2 cycles to execute, and most take much longer.

  6. Why did the Z80 with 4-bit ALU out-perform the fully 8-bit Intel 8080?

    Feb 16, 2020 · Looking at the development and architecture of the Z80, it appears to be a scaled-down, cost-reduced (in terms of total system cost), clone of the Intel 8080. It only used a 4-bit ALU. I assume this

  7. BIOS interrupts vs Hardware interrupts - Retrocomputing Stack …

    Oct 12, 2020 · The original 8088 only defined exceptions for the first 5 interrupt vectors, for Divide Error, Single Step, NMI, Breakpoint, and Overflow respectively. Interrupts vectors 5 through 31 were marked as reserved in Intel's 8086 Family User's Manual:

  8. history - IBM PC memory map - Retrocomputing Stack Exchange

    The 8088 provided an address space of one megabyte. The IBM PC allocated that address space as 640K RAM (not that the 5150 could physically take that much, but the address space was allocated) fol...

  9. ibm pc - Lowest possible chip count of an XT-class IBM PC …

    Mar 24, 2025 · 8088 CPU (DIP-40) 8087 FPU (DIP-40, optional) FE2010A chipset (PLCC-84): a miniaturization marvel of that era, claiming to reduce the number of components in XT-class computer by total 71 pieces, it combined the functions of 8288 bus controller, 8042 clock generator, 8259A interrupt controller, 8237A DMA controller and 8253 timer BIOS ROM (DIP-28)

  10. terminology - What is the technical definition of "clone" that makes ...

    Feb 16, 2024 · What is almost certainly meant meant here is that the K1810MV88 is not a transistor-by-transistor copy of the 8088, but a functional replacement. That's a collection of circuits that do the same job, in the sense of executing the same programs and producing the same results, but are not identical to the circuits in the 8088.

  11. Comparing raw performance of the Z80 and the 6502

    May 21, 2022 · A lot has been said on the internet about the 6502, at 1MHz, being roughly equivalent in performance to the Z80, at 4 MHz. It is said the Z80 has a typical 4 clock ticks per instruction, while the ...