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 …
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 …
8 bit microcomputers - Do I have to use an 8284 chip with the 8088 ...
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, …
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 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 …
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
The decision to use the 8088, a version of the 8086 with the data bus restricted to 8 bits, in the original IBM PC, seems strange on the face of it, certainly hurt performance and intuitively shouldn'...
How to use all memory on an IBM PC with 8086
Dec 23, 2022 · The IBM PC and XT used the 8088 processor. Software compatible with the 8086, but not hardware compatible. The AT used the 80286 processor. The PS/2 model 30 used the 8086 - …
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 operations which …
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 dynamic memory …