Phram 1
About the Phram 1 PCB
Phram 1 is an open source PCB design by piotr-wiszowaty, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 66 mm, with 55 components from 16 distinct parts.
Other key parts include the MC68000FN, 74LVX245, XC2C256-TQ144, AS4C4M16SA and MCP1703A-1802/MB. By type, the board carries 29 capacitors, 11 ICs, 8 resistors, 4 connectors, 1 transistor and 1 crystal.
It belongs with the retro computing designs in this gallery.
From the project
phram\_1 is a Commodore Amiga A600 extension - 8 MB of fast RAM.
phram\_1 is a Commodore Amiga A600 extension - 8 MB of fast RAM.
based on modern parts (CoolRunner CPLD, SDRAM) PCMCIA-friendly: holding reset for more than 3 seconds turns off high 4 MB current consumption around 110 mA speedup relative to stock A600: 33 % (by SysInfo) * successfully tested with CheckMem and MemCheck 1.2 (both available on Aminet).
cpld/ - MMU design files (Xilinx ISE 14.7)
Main components on the Phram 1
Phram 1 bill of materials (BOM)
55 components, 16 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MC68000FN | PLCC68-upsidedown | U1 |
| 6 | 74LVX245 | TSSOP-20_4.4x6.5mm_Pitch0.65mm | U2, U3, U4, U6, U7, U8 |
| 1 | XC2C256-TQ144 | TQFP-144_20x20mm_Pitch0.5mm | U9 |
| 1 | AS4C4M16SA | TSOP-II-54_22.22x10.16mm_Pitch0.8mm | U10 |
| 1 | MCP1703A-1802/MB | SOT89-3_Housing | U11 |
| 1 | MCP1703A-3302/MB | SOT89-3_Housing | U12 |
| 1 | 2N7002 | SOT-23 | Q1 |
| 1 | TQSMT-35 | IS92 | X1 |
| 1 | JTAG | Pin_Header_Angled_1x06 | P1 |
| 1 | TEST | Pin_Header_Angled_1x06 | P2 |
| 2 | CONN_01X01 | Pin_Header_Straight_1x01 | P3, P4 |
| 1 | PWR_LED | R_0805_HandSoldering | D1 |
| 4 | 1uF | C_1206_HandSoldering | C1, C2, C3, C4 |
| 25 | 100nF | C_0805_HandSoldering | C5, C6, C7, C8, C9, C10, C11, C12 +17 |
| 7 | 47k | R_0805_HandSoldering | R1, R2, R3, R4, R5, R6, R7 |
| 1 | 0 | R_1206_HandSoldering | R8 |
Phram 1 design files
The KiCad project lives in the piotr-wiszowaty/phram_1 repository on GitHub; these links point at the commit this page was built from.
- Layoutpcb/phram_1.kicad_pcb
Phram 1: common questions
How big is the Phram 1 PCB?
The Phram 1 measures 100 × 66 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Phram 1?
55 components, from 16 distinct parts. The full bill of materials is listed on this page.
Where can I download the Phram 1 design files?
From the piotr-wiszowaty/phram_1 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Phram 1 design in my own project?
Yes, under the terms of its GPL-3.0 license, which piotr-wiszowaty chose for the repository.
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