The Adaptable Board Computer microprocessor development hardware
system provides the necessary hardware to develop a system that
approximates, as closely as possible, your final system configuration.
By using the ABC hardware, design and assembly time can be reduced
The Adaptable Board Computers versatility and flexibility is
accomplished by including space on the board for additional components
and also by a system of jumper wires which can be used to change the
basic board configuration.
The ABC system is supplied complete with the 2650 microprocessor,
1K bytes of ROM with PIPBUG, (a loader, editor, and debug program),
512 bytes of RAM, I/O ports (serial and parallel), and a system clock.
For those applications where additional components are required to
more closely approximate the final system, the ABC board contains
additional unused plated through holes to accomodate those components.
Connections to the existing components can then be made via jumper
wires or wire-wrap connections. Thus, the user cannot only add components
to expand memory, add I/O or implement additional control features in
his current application, but he can also reconfigure the system to satisfy
future requirements. The ABC system can be purchased assembled or
- Expandable printed circuit card:
Unused area on card filled with plated through holes on .300 in. centers
for wirewrap sockets
- 1k bytes of PIPBUG* ROM (in socket) between units
- 512 bytes of RAM
- Two latched I/O ports
- Four non-extended I/O read/write user strobes
- Tri-state buffers on data, address and control lines
- Serial input/output port
- Single +5 volt supply requirement (1.7A max) for card and 20 mA
current loop interface (+/- 12 volt supply for RS232 interface)
- Simple memory and I/O port decoding with two 16 pin dips
- Interrupt and single step capability
- Simple clock configured from dual monostable multivibrator
- 24k memory expansion capability
- Directly compatible with 4k RAM card (2650PC-2000) and power
supply demonstration base (2650-DS2000)
- Card dimensions: 8 in. by 6.875 in. with a 100 pin connector
along with 8 in. dimension
- 1k bytes of PROM in place of ROM.
- 512 bytes of PROM or ROM in place of RAM.
- Asynchronous operation capability.
- External clock input.
- Interrupt vector from Port C.
- Terminal interface jumper selectable.
A. W4 to W5 and W6 to W7 jumpers select the 20mA current loop mode.
B. W3 to W4 and W7 to W8 jumpers select the RS232 mode.
- Normally high input line (10k pull up resistor on each): INTREQ,
PAUSE, RESET, WBAC, WBAD, CKC, CKD
- Plated through holes are available at each connector pin
to allow for insertion of wirewrap pins.
- Edge connector supplied with each card.
- To allow for external clock input, remove jumper W9-W10.
- Asynchronous operation by removing jumper W1 to W2 and driving OPACK.
- During vectored interrupts, it is possible to allow Port C to place
the interrupt address on the data bus by removing jumper W21-W22 and
Modifications to the basic configuration can be made to provide a mix
of RAM/PROM/ROM memories. PROM memories can be used in place of the
PIPBUG ROM by removing the ROM from its socket and adding one or two
82S115 PROM's (512x8). Area and plated through holes are provided on
the card for insertion of sockets for the PROM's or the PROM's
themselves. Decoding for the PROM's has been provided by ABC 1500 logic.
Data and address lines for 2112 RAM's and 82S129 PROM's or 82S229 ROM's
are identical. It is, therefore, possible to use PROM's and/or ROM's
in place of RAM. This option will require removal of the RAM's (two
per block), and changing the jumper for each 256 byte block of
PROM or ROM added.