REQ - 1970s shift registers sought

[RMC]

Hello

I'd like to buy some rather elderly PMOS shift registers. Does anyone have
any on an old board or can you advise me how to source them please? Internet
searches have found nothing.

Back in the 70s, MSI manufactured the MF7104 (and possibly the MF50052T).

The only details I can give are thus:
http://www.datasheets.org.uk/specsheet.php?part=MF7104
Part Number = MF7104
Manufacturer Name = Microsystems International Ltd
Description = 128 to 250 Bit Shift Register
Bits Per Reg. = 128
No. of Reg. = 2
Data Inp Mode = Serial
Data Outp Mode = Serial
f(oper) Max. (Hz) = 2.0M
t(PLH) Maximum (S) = 300n
Mode Dyn/ Stat = Static
P(D) Max.(W) Power Dissipation = 500m
Vsup Nom.(V) Supply Voltage = 5.0
Status = Discontinued
Package = TO-100
Pins = 10
Technology = PMOS

They are ten legged devices in a TO-100 can (similar to a metal TO-5
transistor package).

I don't know what computer hardware they may have formed part of, but I need
them for a 1970s digital sequencer which forms part of a rare (ish) music
synthesiser, an EMS synthi-AKS.

if anyone can help, please could they post a message in reply?

Thanks

RMC, England

 

[Gerhard]

Hello

I'd like to buy some rather elderly PMOS shift registers. Does anyone have
any on an old board or can you advise me how to source them please?
Internet searches have found nothing.

Back in the 70s, MSI manufactured the MF7104 (and possibly the MF50052T).

The only details I can give are thus:
http://www.datasheets.org.uk/specsheet.php?part=MF7104
Part Number = MF7104
Manufacturer Name = Microsystems International Ltd
Description = 128 to 250 Bit Shift Register
Bits Per Reg. = 128
No. of Reg. = 2
Data Inp Mode = Serial
Data Outp Mode = Serial
f(oper) Max. (Hz) = 2.0M
t(PLH) Maximum (S) = 300n
Mode Dyn/ Stat = Static
P(D) Max.(W) Power Dissipation = 500m
Vsup Nom.(V) Supply Voltage = 5.0
Status = Discontinued
Package = TO-100
Pins = 10
Technology = PMOS

They are ten legged devices in a TO-100 can (similar to a metal TO-5
transistor package).

I don't know what computer hardware they may have formed part of, but I
need them for a 1970s digital sequencer which forms part of a rare (ish)
music synthesiser, an EMS synthi-AKS.

if anyone can help, please could they post a message in reply?

Thanks

RMC, England

I am reasonably sure we used the MF7104 in the mid 70s but had many
problems.
The chips would suddenly become dynamic (only operated as long as we kept
clocking
them fast enough). Some failed all together.
I suspect the circuit synthesiser forms part of some form of digital
delay-line.
I would recommend trying to substitute something such as the MC14517, CD4517
or HFE4517. It will require some redesign on your part to make the parts
fit,
probably cascade more than one, but it might be worth the effort.

To get a specific (non binary power) shift-register length
the CD4006 - multi-tap 18-bit shift-register might be of help.
It seems if both these ICs are still in active production at TI.

Regards
Gerhard van den Berg
CSIR

 

[RMC]

I am reasonably sure we used the MF7104 in the mid 70s but had many
problems.

Gerhard - many thanks for this response. I agree that a modern equivalent
would be the best solution and I may start looking into just that.

Cheers for your help

RMC, England

 

[Jim Backus]

I'd like to buy some rather elderly PMOS shift registers. Does anyone have
any on an old board or can you advise me how to source them please? Internet
searches have found nothing.

Back in the 70s, MSI manufactured the MF7104 (and possibly the MF50052T).

Somewhere I've got a tube of perhaps 50 shift registers. IIRC they are
of similar vintage may be 1 K bit long - package is 8 pin DIP. I think
they were National Semiconductor parts. A quick look has failed to
locate them. If you want me to search further let me know - might take
a while though!