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Rainbow 100B Memory extension board

tradde said:
I have no idea of how to do that for a resistor array.
Click to expand...
10R.png
Most likely it's very similar to this. You should be able to figure out which is pin 1, then measure the resistance between pin 1 and any of the other pins to determine the resistance value.
 
looking at the diagrams of Duell and the rainbow 100b the values should be this.
a check with the multimeter would be very helpful

resistors.PNG

I'm working on the printed circuit routing :p

pcb.PNG
 
For RN4 I get 470 Ohms, RN3 and RN2 I get 1K Ohms, and RN1 I get 470K Ohms.
 
Hi, I just found a paper copy of the original circuit diagram of a 5415961-0-1 Rev A module
It has all the diagrams, all parts listed, but no PCB traces picture is included

I do not now if this document already exists on the web ?

I have no A3 Scanner, so I would need to find someone who can scan this
 
bigfix said:
Hi, I just found a paper copy of the original circuit diagram of a 5415961-0-1 Rev A module
It has all the diagrams, all parts listed, but no PCB traces picture is included

I do not now if this document already exists on the web ?

I have no A3 Scanner, so I would need to find someone who can scan this
Click to expand...

in the last few weeks I have searched everywhere but have not seen these.
it's gold! post some pictures here with your smartphone. I can verify my work before building the card
thank you
 
I have sent hires pictures of the circuit diagrams to na103 - maybe he can post it together with his final plans for everyone benefit
cheers
Guenter
 
Guenter here gave me an early Christmas present :xmas:
the original DEC schematics of 100B extension memory board can you download here
in the next few days I will compare and if necessary update my work.

thank you very much
 
today i got the latest logic ic's and i did a first power up test.
it worked on the first try! and it passing the self-test lasting a few minutes.
i was able to start msdos and word star with no problems.
in the next few days I will do further tests with different memory configurations.
20220131_172717.jpg20220131_172955.jpg
20220131_173358.jpg20220131_173450.jpg
 
I finished the test with the different configuration, bank population, 64kb dram chip and dip setting.
Everything works perfectly!

20220203_090827.jpg

I thank VCFED and the users who sent photos and schematics of the board.

below the list of passive and active components.
the Mouser part number is only present for the components I purchased, the other parts are recycled from other old boards.

passive component:
pos.qt.desc.Mouser part.
C1 - C2727220 nF (0.22 uF) 50V +80-20% Z5U CERC430C224Z5U5TA
FB11Bead Ferrite 0.1380DX 0.330LG2743002112
RN41R network 9-470 2.0% 10 pin4610X-101-471LF
RN3 RN22R network 9-1.0k 2.0% 10 pin4610X-101-102LF
RN11R network 9-4.7k 2.0% 10 pin4610X-AP1-472LF
R10 - R17 R19939 0.25W 5.0%CFR-25JB-52-39R
R181100 0.25W 5.0%CFR-25JT-52-100R
R1 - R9947 0.25W 5.0%CFR-25JB-52-47R
SW11Switch DIP 4POS/SPST 30VDC 50MA
C33110uF 35v +75-10% axial AL ELMAL213831109E3
C28 - C32547nf (0.047 uF) 50V +80-20% CERC410C473Z5U5TA
C34 C35210nF (0.01 uF) 50V +80-20% Z5U CERC410C103Z5U5TA
J11025X025 REC 2X30P5-102766-4
2716 PIN DRAM SOCKET
124 PIN U7 GALV22V10

active component

pos.qt.desc.Mouser part.
E14 E8 E153SN74S03N
E16 1SN74LS00N
E24 E23 2SN74S258N
E321SN74LS27N
E401SN74LS74AN
E71GAL22V10DATF22V10C-15PU
E31 E392SN74LS04N
E221DM74LS125AN
E301SN74LS393N
E381SN74LS244N
E291SN74S280N
E371SN74LS245N
E451SN74S32N
27DRAM CHIP 41256 or 4164 150ns or better
 
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