4 layers337.6 × 105.7 mm
ISA CGA
hkzlab/CGA_Redux
The Color Graphics Adapter Redux board is a more or less faithful clone of the original IBM CGA, based on the original schematics
170 parts56
2 layers100 × 75 mm
PC8001-MEM
kuninet/PC8001-MEM5- Size
- 100 × 75 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 62
- Pads
- 276
- Tracks, vias
- 1,085, 22
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 11 Jan 2021
- Updated
- 15 Mar 2021
Overview
PC8001-MEM is an open-source printed circuit board by kuninet, from the kuninet/PC8001-MEM repository on GitHub, published under the MIT licence. It is a 2-layer board of 100 × 75 mm with 34 parts on 62 nets, routed with 1,085 tracks and 22 vias.
It is built around the 74LS32SC, 74LS175PC and 74LS273PC, with the ULN2003A among its other parts. Its parts include 10 capacitors, 10 ICs, 4 resistors, 4 diodes and 2 connectors.
Main components
4
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
74LS175PC
PDIP-160℃~+70℃ 1 10ns 18mA 25ns@5V,15pF 30MHz 4 4.75V~5.25V 5ns 74LS Series Asynchronous Complementary type D-Type Reset Rising Edge PDIP-16 Flip Flops ROHSTexas InstrumentsFlip Flops
74LS273PC
PDIP-201 15ns 27mA 27ns@5V,15pF 30MHz 5ns 74LS Series 8 D-Type Reset Rising Edge PDIP-20 Flip Flops ROHSonsemiFlip Flops
ULN2003A
SOP-16-40℃~+85℃ 0.93mA 100uA 15pF 20uA 30V 50V Seven channels SOP-16 Darlington Transistor Arrays ROHSUMWDarlington Transistor Arrays
README
README.mdPC-8001 32k x4バンク拡張メモリーボード
概要
- PC-8001のN-BASIC ROM/空きROM領域(アドレス0000h～7FFFh)の裏側に4バンクのメモリーを増設するボードです。
- バンク切り替えはPC-8012/8801などと同様の操作にしています。
拡張メモリー切り替え
- I/Oアドレス E2 :
- bit0 (01h)
- 0 : N-BASIC ROM READ
- 1 : 拡張RAM READ
- bit4 (10h)
- 1 : 拡張RAM WRITE
- bit0 (01h)
- I/Oアドレス E3 :
- メモリーバンク番号を0～4で指定します。リセット時デフォルトは0です。
- 128kB SRAMを4分割(4バンク)切り替えを実施して使用できます。
- 0000h～7FFFhまでが切り替わるため、N-BASIC ROMは見えなくなります。(バンク切り替えし、書き込みのみ許可しておいて 切り替えることは可能)
ライセンス
- 本リポジトリのファイルはMITライセンスで公開します。
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1u | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8, C10 |
| 4 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | MH1, MH2, MH3, MH4 |
| 2 | 74LS138 | Package_DIP:DIP-16_W7.62mm_Socket | U2, U4 |
| 2 | 74LS32 | Package_DIP:DIP-14_W7.62mm_Socket | U1, U6 |
| 2 | 74LS541 | Package_DIP:DIP-20_W7.62mm_Socket | U7, U9 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C9 |
| 1 | 628128 | Package_DIP:DIP-32_W15.24mm_Socket | U10 |
| 1 | 74LS175 | Package_DIP:DIP-16_W7.62mm_Socket | U5 |
| 1 | 74LS273 | Package_DIP:DIP-20_W7.62mm_Socket | U8 |
| 1 | LED_D0 | LED_THT:LED_D3.0mm | D1 |
| 1 | LED_D4 | LED_THT:LED_D3.0mm | D4 |
| 1 | LED_ID0 | LED_THT:LED_D3.0mm | D2 |
| 1 | LED_ID1 | LED_THT:LED_D3.0mm | D3 |
| 1 | MEM-CON | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | PC-8001 ext BUS | Connector_PinHeader_2.54mm:PinHeader_2x25_P2.54mm_Horizontal | J1 |
| 1 | ULN2003A | Package_DIP:DIP-16_W7.62mm_Socket | U3 |
Questions
How big is the PC8001-MEM PCB?
It measures 100 × 75 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PC8001-MEM use?
34 parts, built around the 74LS32SC, 74LS175PC, 74LS273PC and ULN2003A. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the PC8001-MEM KiCad files?
From the kuninet/PC8001-MEM repository on GitHub, at the commit this page was made from: the board is KiCAD/PC8001-MEM.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the PC8001-MEM design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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