2018年10月1日 · The "640k limit" (hole in contiguous RAM) was just 1 of a series of short-sighted, odd, and/or bad decisions involving the PC. Others include a) IBM choosing 8086 family over …

2018年7月11日 · IBM PC never really penetrated the multi-user market until the late 80's and early 90's with the rise of networking, with the better processors (2-3-486s), now able to run …

2024年10月27日 · The very first PC could do stuff only seen in arcade games, like graphics mode vertical scrolling. It involved a little known 160 x 100 video mode called "lores" that was almost …

2018年1月21日 · A PC floppy controller can control two drives. For the third and fourth drive you'd need a secondary controller. I haven't ever seen one for PCI, only for ISA - some ISA cards …

2022年8月15日 · The IBM PC keyboard behaves as though it holds a bitmap of every key that is pressed or released, and repeatedly scans the keyboard, comparing the present of each key …

2017年6月20日 · If the IBM Model M keyboard is one of the ones that uses the AT protocol, you may be able to use a passive 5-pin to PS/2 adapter, chained with an active PS/2 to USB …

2020年6月22日 · How did the parity check DRAM chips work? In particular, is there a reason for the gap in the motherboard (IBM calls this system board) between the parity check DRAM and …

2023年10月31日 · On IBM PC compatibles, the first widely-known display subsystems capable of displaying 640×480 pixels (resulting in square pixels with a 4:3 display) were the MCGA and …

2017年12月27日 · A lot of web sites describe how to create a bootable floppy disk using an existing image (via dd). But what about the image makes it bootable? I'm interested in making …

2021年1月6日 · Jumper selection pre-dated the PC and was how other systems using these drivers operated. IBM's "hack" was to use the cable twist so that all drivers could be jumpered …