PDP-11 memory, ref H-222A
1977-1982Mémoire de 16 kmots de 18 bits
Jiri Picka explique/explains
The H-222A ferrite core memory unit with capacity of 16K x 18 bits is originally from PDP-11 computer made by DEC. The size of the memory unit is 397 x 220 x 15 mm and consists from two boards. The first board (on top) is controll unit with Unibus interface. The second board (bottom) contains the ferrite plane memory.
The core plane:
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The ferrite core plane. It is splitted into 36 blocks. Each block has 32 columns.
The ferrite core plane. It is splitted into 36 blocks. Each block has 32 columns.
The
top view of the bottom board. The ferrite plane is protected with a
plane board..
A
photo solder side of the ferrite core plane. It is bottom side of the
memory unit..
A
detail view to
block's corner of the ferrite core plane. The wire has 0.08 mm
diammeter and the black knots are repairs of the broken wires.
DEC_h222_img7.jpg
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122.58 KB
A detail
view to repairs of the broken wires
.
.
DEC_h222_img8.jpg
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129.70 KB
A
detail view to
ferrite cores. Each ferrite core is traversed with three wires. The
wires have 0.08 mm in diammeter. The cores have approx. 0.22 mm
diammeter.
The controller:
|
|
Controll unit with Unibus interface.
If you have any further information on this board, do not hesitate to contact me!
Fr
Le texte et les photos
sont de 'Jiri
Picka'. Publiés avec
l'autorisation de l'auteur.
Voir son site www.computyerasylum.co.uk
Voir son site www.computyerasylum.co.uk
(Elles ont
subi un léger traitement: dimension, anti-flou, perspective...)
US
The text and 8 published
photos are
from 'Jiri Picka'.
With his kind permission.
Have a look to his website www.computyerasylum.co.uk
Have a look to his website www.computyerasylum.co.uk
(They have
suffered a slight anti-blur, dimension)
eMail :
2008-09-06
you can take/publish every photos from my WEB site.
Only give there a link to www.computerasylum.co.uk
as original source.
.