Morrow - Disk Jockey 2D Floppy
This was one of Morrows most successful
boards. The board was normally sold as board + 8" Drive + cable + drive cabinet
+ software as the "Discus" system. The 2D was listed as Discus 2+2 (8"
double density double sided disks) giving 1.2Mg of storage per disk.
The Thinker Toys DISK JOCKEY 2/D (DJ) board featured
three distinct subsections:
1. A floppy disk controller, capable of reading and writing data in either
single density FM code or double density MFM code with write
precompensation, which can be connected to any floppy disk drive plug
compatible with the Shugart 800/850.
2. A baud rate selectable hardware UART serial interface that allows
communication with a terminal device at TTY 20ma current loop or RS-232
3. Automatic address generation upon reset or power-up which allows a "jump
start" to the boot strap program in the ROM contained on the board.
The DJ pluged into an S-100 bus slot in a system with an 8080, 8085, or Z80
(1.7MHz - 5MHz) CPU. The controller had a cable connector for attaching a
flat cable to the first floppy disk drive, and can control a chain of up to
four drives daisy chained on this cable. A second connector on the DJ was
provided for attatching a terminal device. The DJ used memory mapped I/O.
Device registers used to input from and output to the floppy disk and the
serial port are accessed from the CPU board of the S-100 system by
references to memory addresses. Some registers differ in function depending
on whether they are being read or written.
The manual for this board can be
Morrow S-100 Boards
Disk Jockey FDC
Hard Disk Controller
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