VD-MB 80 Column Unit with System Power Supply and 4 Internal Expansion Slots

The VD-MB is a complete 80-column expansion chassis for the ADAM, combining integrated video generation, a multi-rail power supply (replacing the ADAM printer's power function), and a 4-slot expansion bus for EVE peripherals. The companion MON-80 is the monitor-only version without the expansion bus.

Usable with 80 Character Monochrome Composite Monitor & SOME High Resolution composite Color Monitors

Four (4) Expansion slots for standard EVE products (SP-1, SP-1 P, SS-CC)
Built-in power supply replaces ADAM printer power supply
Composite Video Output — Software selectable so you can choose between ADAM's normal video or the 80-Column video under CP/M

Full emulation of the Heath H19/H89 video display terminal — implemented as a superset of the H19, not the subset used in ADAM's built-in video driver

Optional VT-100 emulation available as custom order
80-Column display of MOST CP/M Software (WordStar, DBase2, SuperCalc, etc.)
24 Line x 80-Col Display w/25th status line
Upper & Lower Case with descenders
Normal & Inverted video display + Line/Block Graphics
ADAM Printer Jack
Software Integration: Shipped with modified CP/M that boots directly into 80-column mode. Video switching between ADAM 40-column (CRT:) and EVE 80-column (UC1:) is controlled through the CP/M IOBYTE — selectable via the STAT command (STAT CON:=UC1:), the CONFIG utility, or programmatically from ZBASIC/assembly. Full escape code support includes cursor addressing, insert/delete line and character, reverse video, graphics mode, and wrap control.

Architecture: The VD-MB uses a CRTC-based video generation approach with its own processor and firmware running the H19 terminal emulation independently of the ADAM's Z80. The chassis contains two large power transformers, voltage regulation with heatsinks, and extensive filtering capacitors — a substantial power supply designed for continuous operation with multiple expansion cards installed.