5140 Starter Disk w/APP Selector
Advanced Diags (dsk format)
Opening the 5140
128K Memory Card
256K Memory Card
CRT Display Adapter
5140 Models 2/22, 5144 Mono Display 1, 5145 Color Display 1
5140 Model 003 And Backlit LCD Option Kit
New Special Features And Functions For 5140 Models 002 / 022
30 pin socket
KB, Audio, system clock, I/O controller
Printer, system timer
LCD Controller RAM
DOS 3.2 or higher is required. (to support the
I have run PC DOS 7 on it. Remember, no
UMB support! First, no 386. Second, it's limited to 640K max!
>Don, you mentioned that the 72 pin connector is ISA, but multiplexed.
... Difficult... I looked at hacking ISA bus cards onto the Convertible
bus. the main problem is that the address and data lines are multiplexed
to get it
all on the connector. You need extra logic to separate the address
lines. I visualise a CRT slice (in this part of the world, they were
and more common than the serial/parallel slice), with the CGA logic
removed, and a slot in the top of the slice with an ISA riser sticking
out. If you have the upgraded power supply (originally released with the
backlit LCD option, but standard in later production), you should be able
to run at
least 2 ISA adapters if they aren't power hogs. Anyone got the schematic
diagrams for the CGA slice?
3.5" 720K Toshiba 4452A0P11 with a 34
pin edgecard connector. Both floppy drives are jumpered DS1
3.5" 720K ALPS DFL413C02B, 34 pin
edgecard. There are two jumpers on the top- SW1 (right rear corner) is
jumpered "1", J1 (center-left front) is jumpered "B-C".
Floppy bezel snaps on drive case. I have used
an 8580 cardede floppy with the big button- slipped right in, bezel snapped
right on (now to figure out how to get 5140 to recognize 1.44!). I see
no P/N or FRU on it.
From Don Hills
There were 2 models of floppy drive: Toshiba and Alps.
The Toshiba used a metal band to drive the heads up and down, the Alps
used a leadscrew. The leadscrew model could not step the heads at the full
stepping rate of most PCs, so the stepping rate was set slightly slower
in the BIOS. Trouble was, the metal band type drive was designed for full
speed, and was very noisy when seeking at the slower speed. I wrote a small
driver that loaded (and unloaded again) during boot to reset the step speed
on machines with the faster drives. The drives looked identical externally,
you had to look in the slot or remove them from the case to see the difference.
PN 2684331 9.6v, 1.8AH
There were some guys on the VM 5140
Forum who talked about how to cut the battery pack apart with a Dremel
and replace the cells with industry >C cells. There is also a fuse in there.
I was one of those guys. If you
couldn't get the "sub C" cells, the trick was to use standard C size cells
and duct tape them into a pack the same shape as the original. This "naked"
pack fitted in the same space as the original pack-plus-case. The battery
compartment was all plastic so the new pack was well protected. Use Standard
charge rate cells.
Consider standard C cells (with tabs) instead
of sub-C, if they are cheaper
yet. The only reason for sub-C cells is that
they will fit back in the
battery case. I used standard C cells (not even
solder tabs, but I am good
at soldering). Of course they did not fit in
the case, but I wired them up
in the same physical pattern to the old cells,
re-using the connector and
thermal fuse from the old battery. Then I placed
strips of cardboard where
required between the cell ends to stop them shorting,
sandwiched the cells
between two sheets of cardboard cut using the
old case as a template, and
bound the whole lot in plastic insulation tape.
This package looked untidy,
but fit just fine in the battery compartment.
Since the battery compartment
is a complete plastic box in its own right, the
original battery pack casing
is not essential.
Open the pack with a hammer and chisel. Clamp
the pack on its side lightly
in a vise with a piece of wood under it for support.
Or, take a piece of
scrap lumber and nail 2 short bits of 2x4 to
it spaced so as to snugly hold
the pack on its side. Apply chisel to the case
join and tap a little harder
each time until it cracks. Start at a corner
and work around the pack.
As for the power supply, as I said in an earlier post there
was a US-only 110V "wall wart" that was only powerful enough to charge
the battery when the system wasn't running. There was also a universal
(100 to 240 volts) power "brick" (P/N 2684292) much like those used on
modern laptops, that provided enough power (15 volts DC, 2.7 amps) to run
the system and all accessories while charging the battery.
The plug is the type that has a metal outer barrel as one contact and
a metal-lined hole down the middle (Center positive) that is the
other contact. Size: now pay attention here. 5.5 mm external diameter,
2.5 mm internal diameter. They also come in 2.1 mm internal diameter, so
the wrong one.
BATTERY CHARGER (#4060):
A 110-volt input feature designed to be used to charge the internal
batteries of the system. It does not provide sufficient power output
to allow system operation while the batteries are being charged
AUTOMOBILE POWER ADAPTER (#4065):
Designed to charge the system battery while allowing simultaneous use
of the system unit. The adapter attaches to the system unit and plugs
into the cigarette lighter outlet in a vehicle with a 12 volt negative-ground
Opening the 5140
From Don Hills
Open the battery compartment door and remove the battery.
This is important, as many parts of the machine such as the memory chips
are permanently powered so long as the battery is charged. The battery
catch is on the bottom of the plug (like a modular phone plug).
Open the display by pressing the two small grey buttons
under the carrying handle at the front right and left corners of the case.
If you don't use the catches, you might snap off one of the small retaining
catches on the LCD screen bezel. Pivot the display backwards until it is
just past vertical. Press on the front bottom (notice the neat-o vertical
serrations?) of the plastic plate covering the front of the display's "neck"
until the plate pivots away from the neck, then lift the display up (wiggle
it slightly side-to-side). This feature is why it's called the "Convertible".
Undo the 4 screws on the rear of the case. Lift and remove
the rear (non pivoting) part of the top cover.
Pull the grey carrying handle forward, exposing 2 small
slots in the case. Use a small screwdriver or coin to press inside the
slots while lifting up on the front of the keyboard. Be careful not to
damage the foil cable. Don't try unplugging it yet, just move it forwards
and lay it on the extended handle.
Note that the keyboard pivots on two small hinges at the front of the
Undo the 4 screws holding the diskette drives in and pull
the drives out. Thumb in the diskette slot, fingers underneath is the best
grip. Note that the floppy drive bezels have catches that fasten them to
the drives. They are not loose!
Reach in through the diskette drive bays with one hand
and through the opening at the rear with the other, and unclip the diskette
drive plugs from the clips on the underside of the (pivoting) top cover.
Lift the rear of the pivoting top cover and slide it forwards
until the pivot pin at the front disengages from the slot it slides in
and lift the cover up and away, unplugging the foil cable to the LCD socket
as you do so.
You can now unplug the keyboard cable.
Reassembly is the reverse of the above, just 3 tricks:
When screwing the diskette drives back in place, BE EXTREMELY
GENTLE. The screws must not be tightened too much- you will crack the drive
front plates and/or break the plastic pillars that the screws go into.
ARE VERY FRAGILE. (Ed. They were cracked on mine)
From Us, the god-Emperor of Microchannel
I found that getting the LCD unit back on was interesting.
Note that the LCD swings on a "trapeeze" that has a metal pin going through
it. Note the two ptllars that come up on each side of the floppy and LCD
headers. Notice the arc made by the top of those pillars. See the groove?
Notice that the open end is toward the front.
What I did- lower the LCD neck to about halfway forward.
This lowers the cross-pin. Looking from the back, directly over the battery
well, you can see the shaft AND the grooves. Now you can actually SEE how
to position the top so the shaft will slide into the grooves.
Back to Don
When replacing the keyboard in its well, make sure the
edge nearest the diskette drives sits on (not under) the small ledges moulded
in the front plates of the diskette drives. These ledges lift the keyboard
to typing position when the case is opened. If you get it wrong you may
break things when you try to close the case. The front corners of
the keyboard have little pivots that mate with the front of the bottom
case. I had ot push down lightly to make them
"snap" in place.
As for piggyback accessories, there were several. They were known as
"slices", because they were the same profile as the back of the machine
and when clipped on looked like an extension of the machine.
A few additions to your page:
There was no way of powering the system off completely without removing
the battery. Some parts of the system, including the memory and much of
the planar, were continuously powered. Being static CMOS logic, they consumed
negligible power when not being clocked. The battery would hold the memory
(and run the clock, there was no separate clock battery) for a couple of
weeks. There was no suitable CMOS diskette controller chip so it used a
standard NEC 765. This was power hungry so was actually powered off when
not in use- the BIOS saved and loaded the controller's state between drive
accesses. I've got a lot more somewhere, including info gleaned from conversations
with the actual developers, and the full IBM Tech Ref and Hardware Maintenance
5140 System Unit Options:
o 128Kb Memory Card (#4005)
o Printer (#4010)
o Serial/Parallel Adapter (#4015)
o CRT Display Adapter (#4020)
o Internal Modem (#4025)
o Printer Cable (#4055)
o Battery Charger (#4060)
o Automobile Power Adapter (#4065)
o IBM 5144 PC Convertible Monochrome Display Model 1
o IBM 5145 PC Convertible Color Display Model 1
The 5140 is available in two models.
The model 2 is equipped with a CMOS 80C88 microprocessor, 64Kb ROM, 256Kb
RAM, an 80-column by 25-line detachable liquid crystal display, two 3.5-inch
diskette drives, a 78-key keyboard, an AC adapter, and a battery pack.
Also included are an Application Selector, SystemApps, Tools, Exploring
the IBM PC Convertible, and Diagnostics.
The model 22 is the same as the
model 2 with Diagnostics only. Both systems can be expanded to a maximum
of 512Kb RAM via 128Kb RAM memory card features, and may include an asynchronous
modem in the system unit. The Model 003 has a backlit LCD and uses
256K memory cards.
At the back of each system unit
is an extendable bus interface. This 72-pin connector allows any
or all of the following options to attach to the base unit: Printer, Serial/Parallel
Adapter, and CRT Display Adapter. Each of these features is powered from
the system unit. The CRT Display Adapter operates only when the system
is powered from a standard AC Adapter. A separate CRT display or television
set attached via the CRT Display Adapter requires a separate AC power source.
128KB MEMORY CARD (#4005):
This card uses (16) SRM2064M-15 chips for 128K.
256K MEMORY CARD (#6030)
This card uses (8) SRM20256M-12 chips for 256K.
From Don Hills
System memory was 640 KB max, with 256 KB as well as 128
KB cards. Any combination could be used up to 640 KB. To reach 640K with
128K cards, several people built a short ribbon cable to extend the last
card's end connector to another 128KB card which they laid on top of the
others under the keyboard.
That was too tight for my liking, so I actually ran the
ribbon cable through to the modem slot and put the 5th card there.
> Was the 640 max due to DOS limitations?
From Don Hills
Hardware limit. Any addresses above 640 KB weren't passed
to the memory cards, they were placed on the bus instead for devices like
the CGA video memory.
Attaches to the back of the system unit, or to an optional
printer attachment cable for adjacent printer operation. It is an intelligent
cpu-based, 40 cps (burst rate) serial, non-impact dot matrix design capable
of low power operation. It draws its power and control from the system
unit. Standard ASCII 96-character, upper-case and lower-case character
sets are printed using a high-resolution, 24-element print head.
An all-points-addressable (APA) print mode for graphics is also provided.
NLQ printing can be accomplished using either a thermal transfer ribbon
on smooth (60 Sheffield units, maximum) paper, or no ribbon on heat-sensitive
thermal paper. Draft-quality printing may be achieved using the thermal
transfer ribbon on IBM Multi-System Paper (P/N 7034548) or equivalent.
There are three controls- A slide potentiometer on the
left is for Density, left is light, right is dark. A two position switch
in the middle, left is Off-Line, right is On-Line. A button is on the right
for Line Feed.
There is a blue lever on the left corner for clamping
the guide against the roller. A paper advance wheel is on the right.
Open printer cover. Look on the left side of the printer
at the front corner of the smoked plastic cover. Notice the well with the
silver loop. Lift up and pivot it out. This unlatches the left side, and
the right side is just a pivot. Twist off the slice, pivoting it to the
PRINTER CABLE (#4055):
A cabling accessory 22 inches (0.6 meter) in length with a custom 72-pin
system-type connector attached to each end. It provides the user the option
of operating the Printer (#4010) immediately adjacent to (that is, physically
detached from) the system unit, to provide flexibility of placement for
ease-of-use and visibility. Mad Max has one of these,
looks like THIS
The adapter provides an RS-232C asynchronous communications
interface and a parallel printer interface that are compatible with the
IBM Personal Computer Asynchronous Communications Adapter and the IBM Personal
Computer Parallel Printer Adapter. Looks like this
CRT DISPLAY ADAPTER
|U1 Hitatchi HD46505RP
P1 72 Pin edgecard
|P2 solder pads for 6 pin header
P3 60 pin header to port PCB
Resolution: 640 x 200 or 320 x 200Colors: 16
|P1 15 pin / 5 pin header
P2 RCA Jack
P3 60 pin receptacle
M1 14.318180 MHz osc
|U1,2 Toshiba TC5565PL-15
U8 Motorola 1503723
U13 Toshiba TC17G022AT
Don Hills sez-
Looking at the side of the adapter, pin 1 is at the bottom.
Column A is on
the left, B on the right. Pins not listed are No Connection.
B1 + Vertical Sync
B3 + Horizontal Sync
6 pin Header
Pin 1 at bottom, column A on left:
A1 +12v DC
A2 Missing (key)
A3 Composite Video
B3 No Connection
Composite Video Pinout
Interior of RCA jack Peak-to-peak amplitude (approx 1.5v)
Exterior of RCA jack is Chassis Ground
It allows the user the option of connecting a separate
CRT display to the system. The optional 5144 PC Convertible Monochrome
Display or 5145 PC Convertible Color Display may be attached via this adapter.
Through the use of optional connectors or cables, the CRT Display Adapter
(#4020) also allows the attachment of the IBM 4863 PCjr Color Display,
IBM 5153 Color Display, or a standard television set.
Don Hills saves my bacon
The RCA jack is composite video out. The 18 pin header
is the CGA output for the monitors (mono and colour) sold specifically
for the Convertible. They came with an optional stand that held the monitor
just above the system unit, in the airspace created by unclipping the LCD
display after opening the unit. The connector is the same as that used
on the PCjr. There is an optional 6 inch long cable with a plug to fit
the header on one end and a 9 pin CGA connector on the other for connecting
a standard CGA monitor.
The 5 pin header is for an optional RF modulator, again
like the PCjr one,
for displaying the composite video on a stndard TV set without video
Each system unit is furnished
with a detachable LCD. When latched closed, it forms the cover for the
keyboard and diskette drives. The LCD is attached via a "quick disconnect"
connector, so that the 5140 System Unit may be placed below an optional
5144 PC Convertible Mono Display or 5145 Color Display.
80x25 text, 640x200 and 320x200 graphics 16K RAM display
buffer, 8KB LCD font RAM
From Don Hills
The original systems had a first generation LCD display-
my first machine came with one. These were grey and low contrast. They
were upgraded with a supertwist LCD (sort of green/navy blue) that had
much better contrast. My first machine came bundled with this upgrade which
I performed myself. I only ever saw one system with the backlit LCD. It
used an electroluminescent panel rather than a fluorescent tube and diffuser.
They fell out of favour because they couldn't produce as much light as
The backlit LCD was OK in very poor light conditions, but in
normal room lighting or sunlight you were much better off with the standard
supertwist. I used to sit up in bed writing code (DOS device drivers in
ASM, for example) with my machine. I had a small lamp mounted on the wall
behind me that shone at just the right angle for good visibility. The display
characters were large, and it was easy to load different fonts into the
font memory until you found one you liked.
Backlit LCD has internal illumination, which means it
can be used in low-light conditions. Battery life is dependent on
the setting of the brightness control. The Backlit LCD works on all
PC Convertible models by plugging it into the LCD assembly, in place of
the current screen, and installing the new power supply. A new power
supply is packaged with the Backlit LCD Option Kit.
Use of the Backlit LCD with the illumination feature turned
all the way up could shorten battery life to between 2.5 and 4.0hours.
The brighter the intensity the shorter the battery life.Battery life is
also dependent on the application used and the amount of I/O activity.
The Light Panel for the Backlit LCD has in excess of 1500 hours of illumination
time. Replacement light panels (81X8536) are available as a maintenance
INTERNAL MODEM (#4025):
Provides the user the capability to communicate with other compatible
units/systems over existing telephone lines. It uses modulation methods
and frequency tolerances equivalent to either Bell 212A (1,200 baud) in
high-speed mode or Bell 103A (300 baud) in low-speed mode. It is offered
as a complete assembly consisting of two cards connected by a cable. The
entire assembly is installed in the system unit.
Modem Port Board
Board is marked Racal Vadic. FCC ID ANO96M4025
|P1 30 pin header to sysboard
P2 20 pin header to Modem Board
J3 Modem port
J4 Dummy port
|M1 ZP 94008-022
M2 Nat'l Semi INS82C50AV
M3 Motorola 4N35Q8647
AP Internal Modem Connector Pinout
I/O Pin Signal Name
I / O
01 + Adress/Data Bit 0
02 + Adress/Data Bit 1
03 + Adress/Data Bit 2
04 + Adress/Data Bit 3
05 + Adress/Data Bit 4
06 + Adress/Data Bit 5
07 + Adress/Data Bit 6
08 + Adress/Data Bit 7
09 + Adress Bit 8
10 + Adress Bit 9
11 + Interupt Request 4
12 - I/O Read
13 + Reset
14 - Data Enable
16 + Adress Latch Enable
18 + Adress Enable
20 + 12 VDC
25 - 13 VDC
27 - I/O Write
28 + 5 VDC
30 + High Z
The main modem board slides into place on top of the battery pack's
|J1 4 pin header, pins snipped
J2 20 pin header to Modem port
M4 ZP 9410-015
|M8 ZP 2120CP
Y1 11.0592 MHz xtal
Y2 4.0320 MHz xtal
Y3 3.579545 MHz xtal
IBM 5144 PC MONOCHROME DISPLAY MODEL 1
The 5144 Display is a 9-inch (measured
diagonally) composite video display that is attached to the system unit
via the CRT Display Adapter. The display stand, an AC power cord, and a
signal cable that connects the 5144 to the CRT Display Adapter are provided
with the 5144. Character box size is 8 x 8 pels. Text modes are 80
x 25 and 40 x 25. Graphics modes are 640 x 200 and 320 x 200.
IBM 5145 PC CONVERTIBLE COLOR DISPLAY MODEL
The 5145 is a 13-inch (measured
diagonally) color display that displays in medium resolution (320 x 200).
It is designed for those customers whose application requirements will
be satisfied by that resolution. It is attached to the system unit via
the CRT Display Adapter (#4020). The display stand, an AC power cord,
and a signal cable that connects the 5145 to the CRT Display Adapter are
provided with the 5145. The display includes a speaker for external
audio output. The 5145 will display business and graphics data in 40 x
25 character mode. In 80 x 25 character mode, the 5145 can be used for
word processing and text applications.
IBM PC CONVERTIBLE SPEECH ADAPTER
The speech adapter is functionally equivalent to the IBM PCjr (TM)
o CMOS ROM has 196 stored vocabulary words
o Supports two types of speech reproduction
- CVSD (Continuously Variable Slope
- LPC (Linear Predictive Coding)
o Microphone interface
o Audio output
CARRYING CASES: Two soft-sided carrying cases are offered for the IBM
PC Convertible. The standard model (#4090) will accommodate the system
unit, system-attached printer, various accessories, and supplies.
The system unit and printer can be operated from within the case.
The compact model (#4095) may be carried by hand, worn over the shoulder,
or carried backpack style. This model holds the system unit in the main
compartment and has an expandable pocket where the printer, accessories,
and paper or a notebook may be stored.
o IBM 5153 Color Display 183-002
Color Display, 5153
o IBM PCjr Adapter Cable for the IBM Color Display (#0021)
o IBM 4863 PCjr Color Display
o IBM PCjr Connector for TV (#0020)
o IBM Communications Adapter Cable (#2067)
o IBM Proprinter (#4201)
o IBM Graphics Printer
o IBM 3708 Network Control Unit
o IBM 3710 Communication Adapter
o IBM Personal Computer Printer Cable
o IBM 5841 Modem - 1200 bps
All IBM Personal Computer, IBM
PCjr, IBM Personal Computer XT, IBM Personal Computer AT, or IBM Portable
Personal Computer options, adapters, and devices not specifically listed
above have not been tested on the IBM PC Convertible System and are not
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