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 …
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 …
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 …
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 …
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 …
8088 - Why does a 80C88 require a decoupling capacitor between …
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 …
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 …
Can DOS make use of more than 640 KB of conventional memory …
Mar 5, 2024 · Related: How to use all memory on an IBM PC with 8086, Who set the 640K limit? — DOS computers with more than 640KiB of conventional memory were a thing in the early …
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 …
Comparing raw performance of the Z80 and the 6502
May 21, 2022 · A lot has been said on the internet about the 6502, at 1MHz, being roughly equivalent in performance to the Z80, at 4 MHz. It is said the Z80 has a typical 4 clock ticks …