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XT8088 backplane installed on an open frame with a power supply. Two CPU/RAM cards are installed, as well as three peripheral cards (VGA, Ethernet, Serial).

1. Introduction

CPUNEC V20 4.77 MHz
VideoParadise PVGA1A VGA 512KB
Hard DiskUSB
PortsPS/2 (Keyboard), RS-232/DE-9, VGA/DE-15, Parallel/DB-25, Ethernet/RJ-45/BNC/AUI

This information pertains to a particular specimen and may reflect upgrades, repairs, modifications, or factory options not present by default.

2. ISA Cards

Closeup of the rear of the VGA card inserted in one of the slots on the XT8088 backplane. It is a 16-bit ISA card, so the part behind the notch is hanging free from the slot.

2 - 1. VGA Controller

This is a 16-bit ISA card based on the Paradise PVGA1A chip. Even with only the 8-bit half of the card edge inserted, it seems to work very well in text and CGA graphics modes. Higher modes are still untested.

2 - 2. Floppy Controller

This section is under construction!

Please stay tuned for updates pending research and development.

Experimenting with several 16-bit ISA floppy/IDE/serial combo boards and the GoTek Floppy Emulator failed with an error about the "DOS area" of the floppy in FreeDOS and ignoring floppies on boot. These same cards work in the 8-bit slots on the Hand386.

We switched to an 8-bit ISA card with Sergey Kiselev's floppy_bios. This gives more fine-grained results (all of which are still failures):

Ideas to try further:

Table of Contents

  1. Introduction
  2. ISA Cards