OngoingC128DCR 256K SRAM replacement
STDC128DCR 256K SRAM replacement
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：CERN Open Hardware License
Cloned fromC128DCR 256K SRAM
Creation time:2022-07-13 14:49:38Update time:2022-08-10 10:19:30
Description
Replaces all of onboard C128DCR DRAM memory by 256K SRAM.
Provides /RAMCAS2 and /RAMCAS3 inputs for 256K expansion (MMU expansion by M. Makela) or something akin to +60/+256K for C64 mode.
Design Drawing
schematic diagram
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PCB
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PCB_SRAM test copyOpen in Editor
BOM
| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 100nF | C1,C2,C3,C4 | C0805 | 4 |
| 2 | Header-Male-2.54_1x2 | H1 | HDR-TH_2P-P2.54-V-M-1 | 1 |
| 3 | 10kΩ | R1,R2 | R0603 | 2 |
| 4 | AS6C2008A-55SINTR | U1 | SOP-32_L20.7-W11.3-P1.27-LS14.1-BL | 1 |
| 5 | SN74HCT573PWR | U2 | TSSOP-20_L6.5-W4.4-P0.65-LS6.4-BL | 1 |
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