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MODEL225
MULTIBUS™
Interface
Capability
All Intellec Series
11/85
models implement the
industry standard MUL
TIBUS protocol. The
MULTIBUS protocol enables several bus masters,
such as
CPU
and DMA devices, to share the bus
SPECIFICATIONS
Host Processor (lPC)
8085A-2
based, operating at
4.0
MHz.
RAM
-
64K
on the
CPU
card
ROM
-
4K
(2K
in monitor,
2K
in boot/diagnostic)
Bus -
MULTIBUS™ bus, maximum transfer rate
of 5 MHz
Clocks - Host processor, crystal controlled
at
4.0
MHz, bus clock, crystal controlled
at
9.8304
MHz
I/O
Interfaces
Two Serial
I/O
Channels,
RS232C,
at
110-9600
baud
(asynchronous)
or
150-56K
baud (synchronous).
Baud rates and
serial format fully programmable
using Intel
8251A
USARTs. Serial Channel 1 addi-
tionally provided with
20
mA current loop. Parallel
I/O
interfaces provided
for
paper tape punch,
paper tape reader, printer, and
UPP-103
Universal
PROM
Programmer.
Interrupts
8-level, maskable, nested priority interrupt net-
work initiated from front
panel or user selected
devices.
Direct Memory Access (DMA)
Standard capability on MUL TIBUS interface;
implemented for user selected DMA devices
through
optional DMA
module-maximum
transfer
rate
ot5
MHz.
10-4
and memory by operating at
different
priority
levels. Resolution of bus exchanges is syn-
chronized by a bus
clock signal derived
independently from processor clocks.
Read/write
transfers may take place at rates up to 5 MHz. The
bus structure is
suitable
for
use with any Intel
microcomputer family.
Memory Access Time
RAM
-
470
ns
max
PROM -
540
ns max
Illtegral Floppy Disk Drive
Floppy Disk System Capacity -
250K
bytes (formatted)
Floppy Disk System Transfer Rate -
160K
bits/sec
Floppy Disk System Access Time -
Track to Track:
10
ms max
Average Random Positioning:
260
ms
Rotational Speed:
360
rpm
Average
Rotational Latency:
83
ms
Recording Mode:
FM
Physical Characteristics
CHASSIS
Width
-17.37
in.
(44.12
cm)
Height
-15.81
in.
(40.16
cm)
Depth
-19.13
in.
(48.59
cm)
Weight -
731b.
(33
kg)
KEYBOARD
Width
-17.37
in.
(44.12
cm)
Height -
3.0
in.
(7.62
cm)
Depth -
9.0
in.
(22.86
cm)
Weight - 6
lb.
(3
kg)
AFN-014248