My pcxt
About the My pcxt PCB
My pcxt is an open source PCB design by ppsilv, published on GitHub. It is a 2-layer board measuring 258.4 × 104.1 mm, with 85 components from 53 distinct parts.
Other key parts include the 74HCT00, 7805, 8284, 8288 and 8088. By type, the board carries 24 capacitors, 15 ICs, 13 resistors, 12 connectors, 11 diodes and 3 transistors.
From the project
A try to make a pc-xt boar with SRAM
PIC 8259 The PC/XT ISA system has one 8259 controller, and the port numbers for configuring it are: Port 0x20: The master PIC's port A Port 0x21: The master PIC's port B
The IBM PC XT uses a single 8259 Programmable Interrupt Controller (PIC) chip that interfaces with the system through the following I/O locations: Ports 20h/0A0h: The command register, which is write only, and the status register, which is read only Ports 21h/0A1h: Corresponds to the slave PIC 8259 – The eCS Dump The BIOS traditionally maps the 8259 PIC's eight interrupt requests (IRQs) to interrupts 8 to 15 (0x08 to 0x0F).…
Main components on the My pcxt
My pcxt bill of materials (BOM)
85 components, 53 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HCT00 | DIP-14_W7.62mm | U1 |
| 1 | 7805 | TO-220-3_Vertical | U2 |
| 1 | 8284 | DIP-18_W7.62mm | U3 |
| 1 | 8288 | DIP-20_W7.62mm | U4 |
| 1 | 8088 | DIP_Socket-40_W11.9_W12.7_W15.24_W17.78_W18.5_3M_240-1280-00-0602J | U5 |
| 1 | 74HCT245 | DIP-20_W7.62mm | U6 |
| 1 | 8259A | DIP-28_W15.24mm | U7 |
| 3 | 74HCT373 | DIP-20_W7.62mm | U8, U9, U10 |
| 1 | AS6C4008 | DIP-32_W15.24mm | U11 |
| 1 | SST39SF040 | DIP_Socket-32_W11.9_W12.7_W15.24_W17.78_W18.5_3M_232-1285-00-0602J | U12 |
| 1 | 74HCT138 | DIP-16_W7.62mm | U13 |
| 1 | 82C55A | DIP-40_W15.24mm | U14 |
| 1 | PIC18(L)F4550-I/P or PIC18(L)F4553-I/P | DIP-40_W15.24mm | U15 |
| 3 | 2N3904 | TO-92_HandSolder | Q1, Q2, Q3 |
| 1 | 6-30 MHz | Crystal_HC49-U_Vertical | Y1 |
| 1 | 20.000 MHz | Crystal_HC49-U_Vertical | Y2 |
| 1 | BARREL_JACK | BarrelJack_Horizontal | CON1 |
| 2 | Conn_01x02_Male | PinHeader_1x02_P2.54mm_Vertical | P1, P5 |
| 1 | NMI | PinHeader_1x03_P2.54mm_Vertical | P2 |
| 1 | LA1034 Logicport Connection | IDC-Header_2x20_P2.54mm_Vertical | P3 |
Show 33 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_01x05_Female | PinSocket_1x05_P2.54mm_Vertical | P4 |
| 3 | CONN_01X10 | PinSocket_1x10_P2.54mm_Vertical | P6, P9, P10 |
| 1 | PIC ISP | IDC-Header_2x03_P2.54mm_Vertical | P7 |
| 1 | USB_B | USB_B_Lumberg_2411_02_Horizontal | P8 |
| 1 | ~{TEST} | PinHeader_1x03_P2.54mm_Vertical | P11 |
| 1 | 30R160U | Fuse_Littelfuse_395Series | F1 |
| 1 | ROM type sel | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | Flash Write Protect | PinHeader_1x03_P2.54mm_Vertical | JP2 |
| 1 | RESET_8088 | SW_PUSH_6mm_H5mm | SW1 |
| 1 | RESET_PIC | SW_PUSH_6mm_H5mm | SW2 |
| 1 | 1N4002 | D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 5.6 V | D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 1 | D | D_DO-41_SOD81_P10.16mm_Horizontal | D3 |
| 1 | Power | LED_D5.0mm | D4 |
| 3 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D5, D9, D10 |
| 1 | LED_RED | LED_D5.0mm | D6 |
| 1 | LED_YELLOW | LED_D5.0mm | D7 |
| 1 | LED_GREEN | LED_D5.0mm | D8 |
| 1 | BT151-500RT.127 | TO-220-3_Vertical | D11 |
| 1 | 1000 uF | CP_Radial_D13.0mm_P5.00mm | C1 |
| 1 | 330nF | C_Disc_D6.0mm_W2.5mm_P5.00mm | C2 |
| 17 | 100nF | C_Disc_D6.0mm_W2.5mm_P5.00mm | C3, C4, C5, C6, C7, C8, C9, C10 +9 |
| 1 | 4.7uF | CP_Radial_D5.0mm_P2.00mm | C12 |
| 1 | 100uF | CP_Radial_D5.0mm_P2.00mm | C17 |
| 2 | 22pF | C_Disc_D6.0mm_W2.5mm_P5.00mm | C18, C19 |
| 1 | 220nF | C_Disc_D6.0mm_W2.5mm_P5.00mm | C22 |
| 1 | 270 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 4 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R6, R7, R8 |
| 2 | 510 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4 |
| 1 | 4.7K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 3 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9, R10, R11 |
| 1 | 47K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12 |
| 1 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
My pcxt design files
The KiCad project lives in the ppsilv/my_pcxt repository on GitHub; these links point at the commit this page was built from.
My pcxt: common questions
How big is the My pcxt PCB?
The My pcxt measures 258.4 × 104.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the My pcxt?
85 components, from 53 distinct parts. The full bill of materials is listed on this page.
Where can I download the My pcxt design files?
From the ppsilv/my_pcxt repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the My pcxt design in my own project?
The repository has no license, so all rights stay with ppsilv. Use it as a reference, and ask the author before reusing the design.
