Ohio Scientific Inc. hardware by board number as compiled by Mark Spankus

(board descriptions follow below)
---------------------------------
300  Single board trainer
400  CPU Board 6502 family or 6800
420C 4K static RAM board (using 2102 RAM)
430  Cassette & Analog I/O
440  Video Board
446  Graphics expansion Kit for 440 board
450  8K EPROM & Parallel I/O + PROM Programmer
455  4K EPROM & Parallel I/O
460z 3 CPU expander: Z80 & 6100, + one of Signetics 2650/Fairchild F8/COSMAC 1802
470  Floppy Disk Controller
471  Floppy Disk Controller (MaCom era - same as 470)
475  Floppy Disk controller package
480  8 slot Backplane
495  Prototyping Board
498  Card Extender Board
500  CPU/4K Ram/Parallel I/O (2 versions)
502  CPU/8K Ram
505  CPU/Diskette Controller/Parallel I/O
510  3 CPU Board (6502, Z80, 6800) (CA-32)  (Macom sold as 2 CPU Z80 & 6502 "CP-1")
520  16K Static RAM board (CM-3A)
522  48K Static RAM board
524  64K (2Kx8) Static RAM board
525  16K Dual port Static RAM Board
527  24K Static RAM board
530  Dynamic RAM Board 16K,32K,48K (4027 RAMS) CM-4,CM-5, CM-6
535  4116 Dynamic RAM board (48K max)
538  Universal Memory Board (CA-26) contains 16 28pin Dip sockets for RAM/ROM/EPROM
540  64x32 Video board monochrome. with serial<->Cassette interface
540B 64x32 Video board incl. color, AC interface
542  Polled Keyboard
543  Numeric Keyboard
550  16 port ACIA (CA-10)
555  5 ACIA, 2 PIA + RAM expansion board
560Z CPU Expander Z80 CPU and IM-600 (PDP compatible)
570  8 port Input/Output w/ real time clock (CA-20) with OSI 48-bus connectors
572  3 PIA expansion board (CA-21) with OSI 48-bus connectors
573  EPROM programmer (CA-23)
574  Analog I/O (CA-22)
575  Prototyping board (CA-24)
580  8 slot backplane
581  17 slot backplane
582  4 slot backplane
583  18 slot backplane
590  Hard disk controller board (dual port ram memory controller?)
592  Hard disk interface board (for 74MB disk system?)
594  ??
595  Hard disk interface board
596  Hard disk interface board (SA1000 interface?) for 10MB disk system
598  Single board Hard disk controller for Shugart SA1004
600  aka C1/Superboard II has CPU/Video/Keyboard/Cassette
600D aka Superboard II/Series II. Supports 64x16 display (48x12 visible), 
     Sound (DAC), color video expansion 
610  Disk controller & RAM expansion board for 600
620  Bus Expander (C1 to OSI 48 backplane interface)
630  Color generator & RAM for C1 series II


Other boards/ alternate numbering for OSI boards
------------------------------------------------

A-12  Disk cable connector board for 470 Disk controller
A-13  Disk cable connector board for 505CPU
A-14  Centronics cable connector board for OSI 555 board
A-15  I/O panel for C4/C8
CA-9  Centronics Parallel printer interface
CA-9D Diablo parallel printer interface
CA-10-1 RS-232 serial interface
CA-10x 16 port serial board RS-232 and/or high speed synchronous (OSI550)
CA-11 32x64 video board (OSI540)
CA-12 96 line remote parallel interface
CA-14 Votrax Voice I/O
CA-15 Modem/Telephone interface, DTMF decode/encode, 300bps modem (UTI) 
CA-15V as above with Votrax module $799
CA-15 Interface board for Joystick, Modem & Printer, 16 PIA lines, 16bit HEAD End 
      card I/O. Standard in C4P-MF, C4P-DMF, & C8P-DF in rear of machine
CA-20 8 Head End card Interface w/ battery backed clock (OSI 570)
CA-21 Head End Card - 48 line parallel I/O & prototyping area. (OSI 572)
CA-22 Head End Card - Analog I/O board
CA-23 Head End Card - EPROM Programmer for 1K to 8K EPROMS. (OSI 573)
CA-24 Head End Card - Prototyping. Solderless breadboard design. 
      Clock Generator 25K-70KHz, 16 stage divider. (OSI 575)
CA-25 Head End Card - Accessory interface for home Security, AC interface etc.
CA-26 Universal Memory Board (OSI 538)
CA-32 Triple processor board (OSI 510)
CA-7S RS232 & two 8 bit DACs one fast A/D & 8 channel mux, 8 parallel I/O (OSI430)

CM-2  4K Static RAM at $D000  L3/CPM
CM-3  16K 2Mhz low power static RAM board (OSI 520)
CM-6  48K 1Mhz dynamic RAM board 
CM-9  24K 2Mhz static RAM board
CM-10 8K Static RAM at $D000  L3/CPM
CM-11 48K 2Mhz low power static RAM board

CD-1P Single 8" floppy 250 Kbyes storage
CD-2P Dual 8" floppy disk 500 Kbytes storage
CD-26 23MB hard disk drive in rackmount enclosure
CD-36 OSMPI 3303 36MB Hard drive in rackmount enclosure
CD-74 74MB Winchester hard disk and interface for OS65U rated 3x faster than other HD.

AC-3P  12" B&W TV/Monitor $115
AC-9TP Centronics 779 110 cps tractor feed printer & interface $1250
AC-11P 300 baud originate/Answer Modem  $199
AC-12P AC Remote Control $175
AC-14  Word Processing Printer NEC spinwriter w/ parallel interface $2795
AC-15P 12" color monitor  $450
AC-16P 2 8-axis Joysticks & cable $39
AC-17P Home security starter $249
AC-18P low cost high speed 8.5" aluminized paper printer w/ upper & lower case $695


Later OSI Systems: (MaCom era)
KeyFamily 300: 10MB 330E, 40MB 330I, 350J/JJ  (4Mhz Z80 64K Mem, CP/M OS)
100031G  MaCom/OSI 8 slot backplane for keysystem
100284G  MaCom/OSI Centronics cable interface board

Systems list
===========================================================================================

Challenger
65-1K  $439
65-4K  $529
65V-4K $675
68-1K  $459
68-4K  $529
    Based on the 6800 CPU, for the causual hobbyist. Comes on with serial interface and is
    compatible with MIKBug software through an additional OSI software utility package.
    4K- Include OSI 4K BASIC on paper tape
4K RAM $139
Single Drive OSI floppy disk $990 
Dual Drive floppy $1490
430 board $89


Model 300 Trainer 
    Completely assembled & tested computer trainer. 6502 CPU, 128 bytes RAM, 8 Data switches,
    7 address switches, memory load, processor reset, processor run, interrupt & memory write
    protect. Two input lines, one output latch.  Manual & 20 experiments.  $99.00

Superboard (1976)
    A complete minicomputer PC board which accepts and 6000 series processor, system clock,
    2 1702 type ROMS, 1Kx8 RAM (2102 type) 1 PIA , 1ACIA current loop & Parallel interfaces
    and built in expansion capabilities.  Bare w/ manual $29  6800 version $69, 6501 version
    $49, 6502 version features internal clock $54

C2-0 Model 500 board $298.00
    Fully populated computer on a board. 8K BASIC in ROM, 4K RAM & Serial Port $298.00

C2-28K 500 Superkit with 440 & 480 populated $398.00
    Fully assembled model 500 configured for video, 32x32 video board, & 8 slot backplane.
    requires power supply, case, ASCII keyboard & monitor or RF modulator & TV.  

C2-1 500-1 Terminal Add-On
    Fully assembled Model 500 & Power supply in case with 2 EIA connectors for loop through
    operation. 4K RAM 8K BASIC in ROM, For use with Terminal and Modem offload timeshare 
    system  $498.00/$429.00
    500-8  (500-1 in 8-slot backplane box) $629

C2-8S Challenger II $545
    8K BASIC in ROM, 4K RAM 6502 & serial port with 8 slot motherboard 

C2-4P Challenger IIP $598.00
    8K BASIC in ROM, 4K RAM, video interface 32x64 (lower case & graphics optional)
    Power Supply & 5v only 4-slot backplane in case with keyboard. 

C2-8P Challenger IIP with 8-slot cabinet $825.00
    8K BASIC in ROM, 4K RAM, video interface 32x64 (lower case & graphics optional)
    Heavy Duty Power Supply & 4-slot backplane in case with keyboard. 

Superboard II $279.00
    8K BASIC in ROM, 4K RAM, 53 key keyboard, req. 5v power supply, display, cassette

C1P $349/4K  $399/8K
    8K BASIC in ROM, graphics display of 256x256 gaming elements. 53-key keyboard, 
    4K RAM (expandable to 8K)  

C1P MF $995.00
    8K BASIC in RAM, 12K RAM 5.25" mini floppy

C4P $698
    4-slot computer 1 slot open. 8K BASIC in ROM, 8K RAM, Demo cassette

C8P $895
    8-slot computer, 5 open slots. 8K BASIC in ROM, 8K RAM, demo cassette

C4P MF $1695
   (single 5.25" mini-floppy 24K RAM OS-65D 3.1 and 2 demo disks
   w/ GT option +$950 (24K 120ns memory 6502C CPU)

C8P DF $2597
   (dual 8" floppy, 32K RAM OS-65D3.1 & 2 demo disks
   w/ GT option +$1825 (48K 120ns memory, 6502C CPU)

C3-OEM
C3-D
C3-S1




OSI Board Descriptions
===============================================================================

Model 400 CPU board
-------------------
Supports one of 6502, 6502A, 6501, 6512, Motorola 6800, 6800A, 6802, 6802B

PROM supports up to two of the following: 
  OSI 65A Serial Monitor, OSI 65V Video Monitor, OSI 65F Floppy disk bootstrap

RAM: optional 1Kx8 of 2102

Serial: ACIA based 20ma current loop or RS-232, up to 100,000 baud.

Parallel: Supports one of the following PIA devices for up to 16 I/O lines: 
   6820, 6520, 6522, 6530, 6830

Buffering for up to 250 OSI boards. Provisions for user supplied front panel 
and DMA capability
Addressing for 2 PROMS: $FExx, $FFxx
		RAM: $0000- $03FF
		PIA: $FDxx
		ACIA $FCxx


Model 420C Memory Board
-----------------------
A 4Kx8/4Kx12 static RAM memory board
Uses 2102 1Kx1 static memories, with optional battery backup using 2 on-board 
NiCd cells or external battery. It has 18 address bits allowing for 256K of 
memory in a system. It can be populated as 4Kx12 for use with the 560Z PDP-8.
Address: any 4K memory address $0000-$0FFF


Model 430B Cassette & Analog I/O
--------------------------------
Can be populated for Kansas City Standard Cassette Interface or for RS-232. Has
8 parallel I/O lines, 2 fast D/A converters, and fast tracking A/D converter 
with 8 channel multiplexer.

Cassette 300 to 1200 baud, RS-232 or current loop, max 50K baud. S1883 UART
D/A - 2 8bit 2v output 300ns settling time 1408L8 chip
A/D - 8Bit -1 to +1v one conversion per system cycle, usable with signals up to
      20 KHz bandwidth. 1408L8
8-channel multiplexor National 3705
8 parallel I/O - 8 TTL latched outputs, 3 used by multiplexor, 8 TTL inputs, non-latched
Address: Normally $FB0x. Decodes 3 lowest adddress bits
	User 8bit out write $FB02 
	D/A #1 write $FB00
	D/A #2 write $FB01
	User 8bit in read $FB01
	A/D conversion read $FB00
	UART	(-SWE) $FB05 read
		(-RDA) $FB07 read
		(-RDE) $FB03 read
		(RESET)$FB06 read
		(-TDS) $FB04 write
		(CS)   $FB05 write


Model 440B Video board
----------------------
The OSI 440 video graphics board is a versitile high performance computer to TV
interface.  It can be economically populated as a terminal providing up to 
32x32 characters on a screen and a keyboard input port. It can maximally be 
populated for 32x32 characters, 128x128 graphics and 4 color alphabetics.

Video - 2V p-p into hi-Z, composite or ttl sync 60hz, 15.450Khz
Font 5x7 uppercase ASCII
Format 32 rows x 32 columns, unmodified TV sets typically display 24 x 24.
Keyboard input: 7 bit parallel ASCII with continuous strobe of at least 50us 
   long-pulsed strobe
Ram: 1K x 6bit default
Graphics option: req. 446 kit, 420 memory board, (additional parts)
Address: Normally jumpered for $???
Color output: uses upper 2 bits of character to select character color. 
   white=0, red=1,green=2,yellow=3


Model 450B 8K Eprom & Parallel I/O + prom programmer
Model 455 4K Eprom & Parallel I/O
-----------------------------------
These boards provide EPROM storage and up to 16 lines of parallel I/O. 
  (req +5, -9v)
Full address decoding anywhere in 64K address space. 4K or 8K
Uses 6820 PIA at $xFxx
455 Board: up to 16 1702 type PROMS (4K max)
450 board: up to 16 6823 type PROMS (8K max), includes onboard EPROM programmer 
  (req -50v programming voltage)


Model 470 disk controller board
-------------------------------
Contains Real-Time clock divider 10us,100us,1ms,10ms,100ms,1S - for jumper to 
PIA CB1,CB2,CA1,CA2 

 Uses 6520 PIA & 6850 ACIA
 PIA: *PB7 - Head Load         *PA7 - Index
       PB6 - Low Current        PA6 - Select Drive 2
      *PB5 - Select Drive 1     PA5 - Write Protect (optional)
       PB4 - Fault Reset        PA4 - Ready (Drive 2)
      *PB3 - STEP               PA3 - Sector (optional)
      *PB2 - Step In            PA2 - Fault
       PB1 - Erase Enable      *PA1 - Track 0
      *PB0 - Write Enable      *PA0 - Ready (Drive 1)
      
       CB1 - 1000ms on 8", 400ms on 5.25
       CA1 - 20ms on 8"

 ACIA: DCD wired to -(-Index & -Sector)
       TXclk 250KHz 8", 125KHz 5.25"

Model 471 floppy disk controller board identical to 470
-------------------------------------------------------
MaCom altered OSI 470 board

Model 475 Floppy disk system with 470 Controller board
------------------------------------------------------
475 Kit include full size General System International Model 110 Disk Drive 
preassembeled with 470 controller board, 4 foot cable, OS65D w/ 8K basic on 
disk.  The 475 board supports soft & hard sector formats at single and dual 
densities. Standard OS-65D software configures the disk for single density 
soft sector format with 250K bytes of user workspace per disk. OS-65D uses 
single index hole disks.  Requires: OSI 65F Floppy Disk bootstrap prom, 
OSI 6500 system running at 1 or 2 Mhz.


Model 480 Backplane
--------------------
8-slots with buffering allowing additional 480 boards to be connected together 
for up to 250 slots


Model 495 Prototyping
---------------------
Supports up to 40 16-pin package chips & 8 40 pin chips


Model 498 Card Extender
-----------------------
Used to extend a card out of the cage for easy servicing. Has connectors on the
top to service Challenger system boards, and along the edge for some OSI 400 
configurations.


Model 500 CPU (C2P)
-------------------
6502 CPU board with 4 -2Kx8 roms supplied with Microsoft Basic in ROM, 
4K of on-board ram, RS-232 or current loop, ACIA, PIA, 3 256 x8 system roms. 
Can be used as the controller for 560Z. Can be used with 430B Audio cassette 
interface, 440B Video Graphics board, & Floppy Disk system.

Address: Ram: 		$0000-0400	(4Kx8 2102 type)
	 Roms (4) 2Kx8: $A000-BFFF	(2316)
	 SYSROM (3): 	$FDxx, $FExx, $FFxx  (1702)
	 ACIA 6850: 	$FCxx
	 6820 PIA: 	$F7xx
Works with OSI 65A serial prom monitor, 65V video prom monitor, and floppy disk
bootstrap proms



Model 502 CPU board (C4P / C8P) (C) 1978
-------------------
CPU board w/ ROM, ACIA
8K Basic in ROM via 4 2Kx8 ROMS, 2K Monitor ROM using priority encoder to 
map various pages to $FFxx, $FExx, $FDxx. ACIA 6850 at $FC00. 8K RAM using 
2114 @ $0000-$1FFF Built in KCS Cassette interface


Model 505 CPU Board (C4PMF) (C) 1978, Rev B (C) 1979
-------------------
Rev A board missing 40 pin expansion connector and 2nd PIA $F7xx
Rev B contains:
CPU board w/ ROM, ACIA, Floppy Disk I/O, Real Time Clock
ROM $FDxx, $FExx, $FFxx
Floppy disk interface: 6850 PIA at $C000, 6850 ACIA at $C010
ACIA 6850 at $FC00 for RS-232 serial I/O. 
Baud jumpers for 75,150,300,600,1200,2400,4800,9600 
Disk PIA $C0xx CB1 connected to 400mSEC (2.5/sec) clock divided from system 
clock (RTC)
Home security - PIA $F700-F703 

I/O at $C704-C70E for connection to A15 I/O board which contains connectors 
for keypads, joystick, buffered I/O contains A0-A3, ø2, R/W, D0-D7 for Head End
Cards. (MDS-since it requires external hardware, without harware installed, 
looks like NULLREAD space I think...)

PIA $F7xx CA2 can be wired to WAIT input allowing control of CPU speed, 1or 2Mhz
PIA $F7xx CB2 output controls CTS select from Modem or Printer serial interface
Uses disk I/O connector board A-13
Case uses port I/O connector board A-15


Model 510 CPU board (C3) (C) 1979
-------------------
3 CPUs: 6502A, 6800, Z-80, ACIA, PIA, 3 1702A PROMS for 6502 (256x8), 
1 1702A PROM for 6800
Address decoding for up to 1MB memory

6502 Proms at $FDxx, $FExx, $FFxx
6800 Prom  at $FFxx
Processor selection manual or connected to PIA PA6, PA7 (01 = Z80, 10=6800, 
   11=6502)
PIA PA0-PA3 -> A16 -A19. PA4 ->ROM/RAM sel, PA5 ->Processor Switch

Also configured as 2 CPU system board with 6502A & Z-80-4, 68B50, 6821, 6810 & 
  2716 DMon EPROM labeled OSI CP-1 


Model 520 16K RAM board (C) 1980
------------------------
Uses 32 4Kx1 EMM 4200 /GTE 4300 22-pin static RAMs (3 voltages, +5, +12, -9) 
fully populated to 16K RAM



Model 522 48K RAM board (C) 1981
-----------------------
Uses 48 1Kx8 22 pin DIP RAM chips (GTE 8104/ NEC D421D) fully populated to 
48K RAM


Model 524 64K Static RAM board (C) 1981
---------------------------------------
Uses up to 32 2Kx8 static RAM (NEC D4016D-1) but generally populated with 
24 chips yielding 48K


Model 525 16K Dual Port RAM (C) 1981
---------------------------
Uses 4K, 8K, or 16K of 2114 1Kx4 static rams, configurable as single or dual 
port. Used in Hard Disk systems. Has 20 address bits 


Model 527 24K static RAM board (C) 1978
------------------------------
Usually populated as 8K, 16K, 24K board using 2114 static rams.
Additional address decoding for up to 1MB (A6-A19)

Model 530 Dynamic RAM board
---------------------------
Can be populated for 16K, 32K or 48K using 4027 RAMS. Requires +5/+12/-9
Had address decoding for up to 20 bits.

Model 535 Dynamic RAM board
--------------------------------
Dynamic RAM board uses popular 4116 chips (48K max) requires +5/+12/-5 (-9)

Model 538 Universal Memory board (C) 1980
--------------------------------
Contains 16 28pin dip sockets. May be populated with +5v only EPROM, ROM or static RAMs.
Supports up to at least 8K EPROM.

Model 540 Rev A video board
---------------------------
Supports 32x32, and 64x32 video modes B&W, with 542 polled keyboard interface
Character memory $D000-D7FF each display row always $40 bytes long
Can be populated with 6bit of memory for 64 uppercase characters, or 8bit for full OSI character set.
Contains KCS cassette interface for serial <-> cassette conversion.


Model 540B video board (C) 1978
----------------------
Supports 32x32, and 64x32 video modes with color, 542 keyboard interface
Character memory $D000-D7FF each display row always $40 bytes long
Color memory $E000-E7FF 4bits.
bit 0: 0= normal(bright txt, color background), 1= inverse(dark txt, bright background)
bit 1-3: 0=yellow, red, green, olive, blue, purple, sky blue, black

Write Register @ $DE00 controls video modes:
bit 0 1=32, 0=64
bit 1 1=tone on (542 keyboard)
bit 2 1=color on 
bit 3 1=enable 38-40Khz AC Home control output

Read Register @ $DE00
bit 7 = video timing counter bit, 0 for 1/120 second, 1 for 1/120 second, based on video clock (60Hz)


Model 542 Polled Keyboard
-------------------------
Usually connect through 540 Video board at $DFxx
Contains A15 connector for I/O board, 8x8 keyboard matrix, 8bit resistor ladder
D/A conversion "noise" output, 8bit "tone" output.

Keyboard write @ $DF00 sets row, read at $DF00 read columns. A bit is set when 
a key is pressed.
Tone enable when bit 1 (0x02) is set at $DE00

Tone generator: frequency out = 49152/I where I= value stored at $DF01
Frequency is based on ???
DAC: Capacitively coupled output from R2R resistor DAC of value stored @ $DF01


550 16 port 6850 Serial Port Board (C) 1977
----------------------------------
Up to 16 6850 ACIA.
For use with multishare system? C3?
Mapped $CF00-$CF1F (ACIA 0 to ACIA 7)


Model 555 Multi I/O expansion & RAM (C) 1979
--------------------------------------------
Contains up to five 6850 style ACIA and two 6821 PIA
Has space for up to 8K of 2114 RAM

Provides parallel & serial I/O capabilities for printers, timeshare terminals, 
console & network interface

Model 560Z CPU expander
-----------------------
Supports Z80 CPU and IM-600 (PDP compatible) microprocessors plus three-way bus
switching and run/single step circuitry. The 560Z runs under the command of a 
6502 based 400, 500, or 510 system.
Can support 64K of memory & I/O, but occupies only 4K of 6502 memory through a
"sliding port-hole"


Model 570 8 Port I/O with Real Time Clock (C) 1980
-----------------------------------------
Contains National Semiconductor NS58167 real time clock chip, 6821 PIA, and 
battery holders for 3 AA size batteries.  8 16-pin DIP sockets for external 
interfacing Head End Cards. Needs 1 OSI slot in backplane. 
Recommended for C2 & C3 series computers, may also be made to work in C4P & C8P.


Model 572 3 PIA expansion
-------------------------
3 PIA (6821) expansion board with OSI 48-bus connectors can be used as head end 
card or on OSI 48 backplane


Model 573 EPROM programmer
--------------------------
Head End Card EPROM Programmer for 1K to 8K EPROMS. (5v only)


Model 574 Analog I/O (C) 1980 (CA-22)
-----------------------------
Head End Card Analog I/O Board - Analog I/O Designed as a high speed analog I/O but differs from 
other HEAD END CARDs in that it can be plugged directly into the computers 
standard bus. 16 channel analog multiplexor, sample & hold. 8 or 12 bit 
operation. 66K samples/sec 8bit 28K in 12bit.  2 high speed DAC, 8 or 12 bits.
3 TTL level inputs, 6 open collector outputs.
Contains 2 Burr-Brown "ADC80AGZ-12" and 2 Burr-Brown "DAC80 Z-CBI-I"


Model 575 Prototyping board
---------------------------
Head End Card Prototyping board. Solderless breadboard design. 
Contains clock generator 25K-70KHz, and 16 stage divider.

Model 580 Backplane
--------------------
8-slots for use in many C2-8P, C8 and some C3 systems

Model 581 Backplane
------------------------------------------------------
17-slots for use in long case

Model 582  4 slot backplane
---------------------------
4-slots for use in C2-4P, C4P desktop cases

Model 583  18 slot backplane
---------------------------
18-slots for use in large C3 systems

Model 590 Hard Disk Interface & memory controller (C) 1981
----------------------------------------------------------
Contains 12 pin board connector for OSI 596 and 2 16 pin headers for cable 
from OSI 596
Contains 2nd OSI 48 bus for connection to OSI 525 dual port static RAM board


Model 596 Hard Disk Interface (C) 1980
--------------------------------------
Contains 50 pin cable to Shugart SA 1004 Hard Disk
20 pin cable to attach to Hard Disk controller (SA1000?)
12 pin plug bridges to 590
Also has 2 16 pin cable to attach to OSI 590 board
Disk controller interface (SA1000?) attaches to top of this board


Model 598 Hard disk controller for Shugart SA1004 (C) 1982
----------------------------------------------------------
Contains interface to directly connect to Shugart SA1004 8" hard disk
8K of 2114 RAM
One 50 pin cable header and one 20 pin cable header connect to SA1004


Model 600 (SuperBoard) C1-P
----------------------
Complete computer on one circuit board.
Contains 6502 CPU, RAM, ROM, BASIC in ROM, Keyboard, Cassette & video out
Video arranged in 32x32 display, 24x24 visible.
Keyboard $DFxx (uses inverted values compared to 540 polled KB interface, 
   bit is 0 when key pressed)


Model 600D (SuperBoard II) Series II
--------------------------
In addition to OSI600 features, it supports 64x16 display (48x12 visible), 
Sound Output (DAC) 
Color video expansion option
Populated RS-232


Model 610 disk expansion for 600 board
--------------------------------------
Contains disk controller & decoder logic similar to 470 board along with up to
24K static RAM

Model 620 Bus Expander for 600/610 board
----------------------------------------
Contains 40 pin socket for connection to OSI 600/610 board and buffers to interface
to OSI48 backplane board (OSI480, OSI582) for additonal expansion.


A-13 board
-----------
Plugs into the bottom of the 505 board. Used to connect 34 pin ribbon cable to 
external disk drive.


A-15 board
-----------
Mounted in back of a OSI C4P-MF, C4P-DMF, C8P-DF
Contains the following connectors: Joystick & Numeric Keypad, Modem & Serial 
Printer, 16 PIA lines normally used for the Home Security System (AC-17P), 
16 pin I/O Bus for HEAD END CARDs.

Attaches via 40 pin DIP socket & cable.


HEAD END CARDS
--------------
CA-9  Parallel (Centronics) Line Printer Interface
CA-12 96 line remote parallel interface

CA-14 Voice I/O board with Votrax module

CA-21 Board - bit switching & sensing. 48 line parallel I/O featuring 3 PIA & 
prototyping area. (OSI572)

CA-22 Board - Analog I/O Designed as a high speed analog I/O but differs from 
other HEAD END CARDs in that it can be plugged directly into the computers 
standard bus. 16 channel analog multiplexor, sample & hold. 8 or 12 bit 
operation. 66K samples/sec 8bit 28K in 12bit.  2 high speed DAC, 8 or 12 bits.
3 TTL level inputs, 6 open collector outputs.

CA-23 Board - EPROM Programmer for 1K to 8K EPROMS. (OSI573)

CA-24 Board - Prototyping. Solderless breadboard design. Clock Generator 
25K-70KHz, 16 stage divider. (OSI575)

CA-25 Board - Accessory interface. Designed to implement some of the functions 
normally associated with the AC-17P Home Security and/or Wireless A.C. Remote 
Control systems to a C2 and C3 series computers.