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An addendum to romanon's topic from almost ten years ago, avoiding thread necromancy and adding some technical quirks and details: one of the PC/XTs from Czechoslovakia, the Tesla SMEP PP 06, produced between 1986 to around 1990. With the Western embargo having eased up a little, it was evident...

Hi everyone, for all the IBM PC/AT afficionados, I came up with a small software stub that allows to load a BIOS SETUP utility inside the ROM BIOS of an AT - a machine that normally required this to be done using an external SETUP disk or application. This was accomplished by replacing the 32K...

Hi everyone, for those that are not afraid of a soldering iron, I made an open source board called MegaFDC. It utilizes floppy controller chips from old PC expansion cards, runs on a popular Arduino Mega and provides a "DOS-like" shell with some basic functions, read and write, incl. disk...

Hi everyone, does anyone know why an A500 with a 1MB-capable "Fat Agnus" (CSG 8372A) cannot actually address full 1MB (1024K) of RAM ? It seems to be around 6 kilobytes short, reporting in SysInfo as a 1018K total, with an upper address bound of $000fe7ff. In the Workbench CLI, "avail" returns...

Hi, Does anyone have a schematic for the 256K Quadboard made by QuadRAM? I do seem to have some difficulties trying to get the parallel port working on mine - it does not show up in the system regardless of it being set to LPT1 or LPT2. So far I was able to rule out address or resource conflicts...

Hi all, I'm currently awaiting one of these clunkers and I was wondering if anyone got a complete copy of the schematics, i.e. including its audio amplifier and power supply stage. There's some info on the Web which states that these monitors are internally similar to an IBM 5153, which has a...

Hi everyone, For the benefit of other fans of vintage x86 machines, I've developed a ROM code that enables you to boot from a parallel port, by means of a cross-over parallel cable and a machine that provides a bootable image (currently DOS or Windows). I use this in my 5150, if there's no...