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 may take either 1 …
8088 - Why does a 80C88 require a decoupling capacitor between its …
Oct 14, 2025 · I've noticed that the 80C88 from Renesas (datasheet here) has what is for me a quite unusual recommendation for decoupling: Namely, it recommends the usual 100 nF capacitor …
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-bit pattern, …
Newest '8088' Questions - Retrocomputing Stack Exchange
Nov 17, 2025 · 8088 CPU A16-A19 address lines go crazy with nop test after 0FFFF address I'm building a minimal, minimum mode 8088 computer. I started with an 80C88-2 (CMOS, static variant) …
What is the fastest 8088-compatible machine? [closed]
Jan 18, 2023 · What is the fastest 8088-compatible machine? If it's right that Juko XT is the fastest 8088-compatible machine, please also explain why NEC V20 was used to operate only up to 12 MHz …
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 …
Help porting nasm code down from 386 to 8088 (shifts by more than 1 …
Apr 24, 2023 · 13 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 help translating …
When 8086 and 8088 actually sample READY to determine if wait states ...
Jul 17, 2022 · Just for hobby and research purposes I design an XT compatible machine based on 8086, and now I have to come up with a wait state generator for IO devices that are slow and require …
What did the 8086 (and 8088) do upon encountering an illegal ...
Jun 11, 2019 · For instance, the 8086 and 8088 processors do not support detection of illegal instruction operation codes, but this capability is available on the 286 and above, which trap on an attempt to …
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 different, with a fast …