Replica of a VGA card
- V0.1 Initial revision 2021 made with Sprint-Layout
- V0.2 Second board revision with tidied up components, new numbering and improved Silk screen
This replica of a VGA graphics card is based on the AVGA1 or CL-GD5401 graphics chip. The video memory is 265kb. The card work in 8 and 16 bit systems.
Top view
8-Bit mode
16-Bit mode
| Quantity | Description | PCB/Schematic's Reference |
|---|---|---|
| 2 | CAP CER 220PF | C1, C2 |
| 6 | CAP CER 47PF | C3, C4, C5, C6, C7, C8 |
| 2 | CAP ELKO 2,2UF RM 2,5 | C9, C10 |
| 3 | CAP ELKO 22UF RM 2,5 | C11, C12, C13 |
| 9 | CAP CER 100NF | C14, C15, C16, C17, C18, C19, C20, C21, C22 |
| 1 | CONN HEADER 15POS FEMALE | CN1 |
| 4 | DIODE 1N4148 | D1, D2, D3, D4 |
| 3 | FERRITE | L1, L2, L3 |
| 1 | 2N3904 | Q1 |
| 1 | TL431 | Q2 |
| 2 | RES 33 OHM 5% 1/4W | R1, R2 |
| 1 | RES 360 OHM 5% 1/4W | R3 |
| 1 | RES 1.0K OHM 5% 1/4W | R4 |
| 3 | RES 150 OHM 5% 1/4W | R5, R6, R7 |
| 1 | RES 1 OHM 5% 1W | R8, R11 |
| 2 | RES 75 OHM 5% 1/4W | R9, R10 |
| 1 | IC AVGA1 OR CL-GD5401 | U1 |
| 2 | IC HY534256 RAM | U2, U3 |
| 1 | IC 74LS244 | U4 |
| 1 | IC 27C256 EPROM | U5 |
The project is available for free use
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