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Content 4/4

ZX1541 Interface in THT



I had already presented this interface here, but in a version with SMD components. Since many do not like to solder SMD, I have created the interface again, but this time completely in conventional through-hole assembly.


Otherwise, everything I said about the SMD version of the interface applies, except of course the parts list.


Assembly


The interface is very densely packed. But should still be very good to solder even for beginners.


Except for the RAM component, everything is very easy to reach. Since this interface should also find space in the housing of an old 16K memory expansion, the space was of course limited.


Therefore I placed the RAM below the EPROM. Furthermore I chose the narrow version with 7.62mm width.


The RAM component must also be soldered unfortunately, because there is no more place for a socket.


Here once in the 3D view, how the RAM is installed:



To use the EPROM now, it must of course be installed in a raised position. For this you either take an IC socket and cut it accordingly. Or socket strips are used.


The RAM should be soldered first. Then insert the EPROM into the cut IC socket or socket connectors and solder it in. So you don't have the problem later that the EPROM could not fit.


Apart from that there is nothing else to consider.


Bill of materials used in this project

Texas Instruments SN74LS174N
1
Texas Instruments SN74LS32N
1
Texas Instruments SN74LS06N
1
Texas Instruments SN74LS365AN
1
Texas Instruments SN74LS139AN
1
Texas Instruments SN74LS08N
1
Microchip / Atmel AT28C64B-15PC
1
Hitachi HM62256BLSP7
1
Yageo CFR-25JB-52-33K
1
Yageo CFR-25JB-52-4K7
1
Yageo CFR-25JB-52-680K
2
Yageo CFR-25JB-52-1K
7
Yageo CFR-25JB-52-10K
1
Diotec BC557C
1
NTE Electronics NTE2355
2
Wurth Electronics 151033GS03000
1
Wurth Electronics 151033RS03000
1
NXP Semiconductors 1N4148
8
Samtec TMM-105-03-S-S
1
Sullins PRPC002SFAN-RC
1
Sinclair Edge Card Connector
1
KEMET C315C105K3R5TA
1
Ceramic Disc Capacitors 100nF -20%~+80% 50V Through Hole,P=2.54mm
8
Jan 18,2021
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