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STD 42D Memory Module
No Profile
License: GPL 3.0
Description
The design is based on SMBakers 64k memory module (www.smbaker.com).
Pageable 64k RAM memory module using 2x 32k RAM chips a 64kb ROM (16/32kb).
I recommend using SCMonitor R3 with this module for ordinary operation.
The module has been modified to be working with the #28 Z180 CPU module and SCMonitor 1.00 43.
Address selectable, the default address is $38.
RC2014 compliant
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 62256P | RAM1,RAM2 | DIP28-600 | 2 |
| 2 | 100nF | C2,C3,C1,C4,C5,C6,C7 | RAD-0.1 | 7 |
| 3 | 27C512D | ROM1 | DIP28-600 | 1 |
| 4 | SN74HCT32N | U4 | DIP14 | 1 |
| 5 | SN74HCT74N | U2 | DIP14 | 1 |
| 6 | SN74HCT139N | U1 | DIP16 | 1 |
| 7 | SN74HCT238E | U3 | DIP16 | 1 |
| 8 | DIP switchEI-08 | DIP1 | DIP-8-2.54MM | 1 |
| 9 | 2.54mm 1x40P | RC40_BUS | HDR-2.54-Z-1X40P | 1 |
| 10 | Header-Male-2.54_1x3 | P4,P6 | HDR-3X1/2.54 | 2 |
| 11 | Header-Male-2.54_1x1 | P5,P7 | HDR-1X1/2.54 | 2 |
| 12 | 10k | R1,R2 | AXIAL-0.3 | 2 |
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