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  • What was the IBM PC cost saving for using the 8088 vs 8086?
    So an 8-bit machine needed eight of them to populate a memory region A 16-bit machine needed sixteen 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
  • 8 bit microcomputers - Do I have to use an 8284 chip with the 8088 . . .
    The 8088 (and the modern replacement 80C88) is available in two speed grades: 80[C]88 (max clock speed 5MHz) and 80[C]88-2 (max clock speed 8MHz) For the 5MHz variant, the requirements for the CLK pin timings are specified as:
  • 8088 - How to keep the instruction prefetcher filled up . . .
    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 Any instruction that accesses memory takes at least 8 cycles, and often more like 15-20
  • When 8086 and 8088 actually sample READY to determine if wait states . . .
    A tricky issue when dealing with 1980s data sheets is that they fail to make clear which inputs are fully double synchronized, and which ones could go metastable, with unpredictable consequences, if setup hold times are violated
  • Did the IBM PC use the 8088s NMI line? - Retrocomputing Stack Exchange
    As I understand it, the Intel 8088 CPU used in the original IBM PC had two interrupt lines: INTR and NMI INTR was fed from the Intel 8259 Programmable Interrupt Controller, which handled the IRQs from the rest of the system (and presented the interrupt number on lines AD0-AD7 for the CPU to read) What, if anything, was the NMI line connected to?
  • Help porting nasm code down from 386 to 8088 (shifts by more than 1 bit)
    Most of the instructions in your snippet are 80186 instructions 8088 could only shift by 1 directly or with a counter in CL It was the 186 that introduced the shift by constant NEC V20 V30 do implement these instructions it is therefore possible to equip an 8088 class machine with these instructions but requires to swap the cpu
  • The start of x86: Intel 8080 vs Intel 8086?
    @PeterCordes: I've done by share of griping about the 8088 back in the day, but I now recognize that the fundamental design was a work of genius The thing I'd be most curious about is what Stephen Morse thinks of his segmentation design
  • Did any 8-bit CPUs use dynamic memory for registers?
    The 8088 was transitional to the 16-bit era Presumably the earlier, 8-bit CPUs would have had even more need to conserve chip area Did any of the 8-bit CPUs use dynamic memory cells for registers? If not, why not? Do static cells run faster, did designers expect people to want to be able to freeze the CPU, or is there some other disadvantage?
  • 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) followed by 384K everything else (BIOS ROM, video memory, other memory mapped expansion cards etc )
  • How much did IBM save by limiting the PC to 4. 77 MHz?
    The 8088 master clock operates at 4x RAM cycle speed Mind you, all these systems above have one system clock per memory cycle The Intel philosophy was quite different, with a fast master clock, but memory fetches only occurring at 1 4 of this speed So the IBM PC clock was chosen, still worshipping the color clock, at 4 77 MHz -- crystal 3





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