memory layout - In the 8088, what was the time/cycles penalty for ...
Nov 5, 2025 · Depending upon whether the prefetch unit was running ahead of or behind the execution unit (usually ahead on the 8086; usually behind on the 8088), use of an ES prefix …
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 …
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 …
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 …
How much did IBM save by limiting the PC to 4.77 MHz?
Mar 11, 2020 · 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 …
Why is the Intel 8086 CPU called a 16-bit CPU?
Jul 18, 2019 · The 8088 has a 16-bit ALU, but an 8-bit memory bus. Nearly all operations involving registers can be performed on 16-bit values just as fast as with 8-bit values, but …
How did 8088/86 PCs implement flood-fill before SSE and GPUs?
Aug 2, 2025 · Or just that 8088 was an afterthought, with 8086 with 16-bit bus being the primary target, although I assume misaligned rep movsw is total garbage there.) So if you have an 8 …
Did any 8-bit CPUs use dynamic memory for registers?
Nov 19, 2020 · 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 …
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 …
Help porting nasm code down from 386 to 8088 (shifts by more …
Apr 24, 2023 · I have been writing some small asm COM program using Netwide Assembler (nasm), but am having trouble getting it to run on 8088 emulators like PCjs. I could use some …