4 layers231.9 × 218.7 mm
2 layers100 × 75 mm
K68-VDG
kuninet/K68-VDG3- Size
- 100 × 75 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 111
- Pads
- 322
- Tracks, vias
- 1,669, 78
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 5 Sep 2020
- Updated
- 20 Mar 2025
Overview
K68-VDG is an open-source printed circuit board by kuninet, from the kuninet/K68-VDG repository on GitHub, published under the MIT licence. It is a 2-layer board of 100 × 75 mm with 48 parts on 111 nets, routed with 1,669 tracks and 78 vias.
It is built around the 74LS245SC, 74HCT573D and 74LS02PC, with the 74LS32SC, 2SA1015 and 2SC1815 among its other parts. Its parts include 13 capacitors, 10 ICs, 9 resistors, 3 diodes and 2 transistors.
Main components
674LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74HCT573D
SO-20-300mil-40℃~+125℃ 13ns 20ns 4.5V~5.5V 74HCT 8 8uA 9ns D Latch Tri-State SOIC-20 Latches ROHSNexperiaLatches
74LS02PC
DIP-140℃~+70℃ 15ns@5V,15pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA 8mA NOR Gate DIP-14 Logic Gates ROHSonsemiLogic Gates
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
2SA1015
SOT-231 PNP 100nA 130 150mA 200mW 300mV 50V 5V 80MHz PNP SOT-23 Bipolar (BJT) ROHSHXY MOSFETBipolar (BJT)2SC1815
SOT-23-55℃~+150℃ 1 NPN 100nA 130 150mA 200mW 250mV 50V 5V 80MHz NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
README
README.mdSBC6800/6809/6303用 VDGビデオボード
★★REV1.1 既知のバグ: ☆☆
ガーバーデータに誤りがあり、2SC1815と2SC1015のシルク印刷が逆転しています。Q1、Q2の部品番号シルクが正しいです。
概要
- SBC68系バスにつながるMC6847 VDG LSIを使用したビデオボードです。
- REV1基板はアドレスデコードラインにバグがあります。REV2で改善します。プリント基板をお使いの場合は、パターンカット、ジャンパが必要です
メモリーマップ
- 本基板はVRAMとして8kBのメモリー領域と、VDG設定用レジスタがメモリーマップドI/Oとしてメモリーを占有します。
- 本基板はTomi9さん作のSBC I/O( https://sbc738827564.wordpress.com/2018/08/11/sbc-io-rev02/ )と共存できることを目指しています。
| メモリーアドレス | 用途 |
|---|---|
| $8110 | VDG設定用レジスタ |
| $A000-$BFFF または $C000-$DFFF | ビデオRAM |
SBC68系バス
- Tomi9さん作のSBC I/O ( https://sbc738827564.wordpress.com/2018/08/11/sbc-io-rev02/ ) に準拠しています。SBC6303ルーズキットとは若干信号線が異なりますのでご注意ください。(ジャンパを実施すれば使えます)
ディレクトリ構造
| ディレクトリ | 用途 |
|---|---|
| KiCAD/ | KiCAD用データ |
| image/ | 回路図等イメージデータ |
ライセンス
- MITライセンスで公開します。
Special Thanks
- 本基板は先人のみなさまの情報で作成することができました。
- pmig96さん・・・MC6847テストサーキット
- Tomi9さん・・・SBC I/Oボード
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 0.1u | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R9 |
| 2 | 74LS244 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U6, U9 |
| 1 | 10pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C2 |
| 1 | 1N4007 | Diode_THT:D_DO-34_SOD68_P10.16mm_Horizontal | D3 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical | R1 |
| 1 | 1k | Potentiometer_THT:Potentiometer_Vishay_T73YP_Vertical | RV1 |
| 1 | 2SA1015 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1 |
| 1 | 2SC1815 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q2 |
| 1 | 3.3k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 3.579545MHz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | 3.9k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 360 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 50pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C3 |
| 1 | 560 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 62256 | Package_DIP:DIP-28_W15.24mm_Socket_LongPads | U8 |
| 1 | 74HCT573 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U4 |
| 1 | 74LS02 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U5 |
| 1 | 74LS138 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U10 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U7 |
| 1 | 74LS32 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U3 |
| 1 | 75 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 8000-JP | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | A000-JP | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | A13_LED | LED_THT:LED_D3.0mm | D1 |
| 1 | A14_LED | LED_THT:LED_D3.0mm | D2 |
| 1 | MC1372 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U2 |
| 1 | MC6847 | Package_DIP:DIP-40_W15.24mm_Socket_LongPads | U1 |
| 1 | SBC6303 BUS | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Horizontal | J2 |
| 1 | VRAM-JP | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm | JP1 |
| 1 | Video Out | RCA:RCAConAE | J1 |
Questions
How big is the K68-VDG PCB?
It measures 100 × 75 mm and has 2 copper layers, 1.6 mm thick.
What parts does the K68-VDG use?
48 parts, built around the 74LS245SC, 74HCT573D, 74LS02PC and 74LS32SC. 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 K68-VDG KiCad files?
From the kuninet/K68-VDG repository on GitHub, at the commit this page was made from: the board is KiCAD/K68-VDG.kicad_pcb and its schematic KiCAD/K68-VDG.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the K68-VDG 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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