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 …
Did DOS on the early, slow machines ever fail to handle interrupts ...
Nov 17, 2025 · DOS on the 8088 had to process interrupts and return. If a higher-priority interrupt occurred, the current handler was pushed and the higher-priority interrupt was serviced. 4.77 …
Reviving the Cassette Port on an XT Clone Motherboard
Nov 5, 2024 · I recently acquired an XT clone motherboard, which appears to have been sold by a company called Pax Electronica Japan. There are three notable aspects about it: its layout …
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 …
terminology - What is the technical definition of "clone" that …
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 …
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 …