# Modules Planned modules for the main board, to replicate all of the functionality of the original device. # KBD - Keyboard ## Duties Convert the stock keyboard into USB ## Parts - Teensy 4.1 - Original Keyboard ## References ### Keyboard Matrix ``` @ Connector Top Down B D F H J 2 4 6 8 X A C E G I K 1 3 5 7 X X ----------- ----------- 1 3 5 7 X X A C E G I K 2 4 6 8 X B D F H J ``` | | A | B | C | D | E | F | G | H | I | J | K | |---|---|-----|----|---|---|---|---|----|-----|----|---| | 1 |` ~| F1 | F3 |5 %|F5 |7 &|F10| F8 |Rshft|LArr|*-*| | 2 |Esc|LCtrl| F2 | F4|Spc|F6 |F9 | F7 |\ \| |DArr|*-*| | 3 |1 !| Fn |3 # |4 $|6 ^|8\*|9 (|RCtl| *-* |UArr|*-*| | 4 |Tab| Z |LAlt| T |Ent| U |0 )|RAlt| + = | N |Del| | 5 |Fn?|LShft| E | R | M | I | O |[ { | ' " |RArr|*-*| | 6 |Cap| 2 @ | D | F | B |. >| P |F11 | - _ |Num |Scl| | 7 | Q | W | X | G | Y | K |; :| H | F12 |Back|Ins| | 8 | A | S | C | V | J | L |/ ?|, < |\] } |PrSc|Pas| # RTC - Realtime Clock ## Duties - Emulate a DS1307 real time clock chip - Optionally implement extra ram set/recall - Optionally implement DS3231 alarms, temperature ## Parts - Reuse the Teensy 4.1 that's handling Keyboard input - CR1220 Battery (recycled from 380XD repair) # PWR - Power Supply ## Duties - Provide +5v power to the computer - Provide charging current for the Ni-Cd battery - LED outputs for Power on, Battery Present, Charging, Charge complete ## Parts - LM2576 (TI?, 3A?) [lm2576hv.pdf](https://wiki.trevorsacks.com/attachments/1) - ATTiny84 Ni-Cd Monitor [ATtiny24A-44A-84A-DataSheet-DS40002269A.pdf](https://wiki.trevorsacks.com/attachments/2) - Based on Freescale MC68HC908QY4A Example [AN2679.pdf](https://wiki.trevorsacks.com/attachments/3) [AN3392.pdf](https://wiki.trevorsacks.com/attachments/4) # CPU - Computer ## Duties Actually handle the computer parts of the computer ## Parts Either (Depending on need for HDMI and PCI) - Raspberry Pi Compute Module 3 - Raspberry Pi Compute Module 4 # DSK - Floppy Disk Drive [![PinoutTEAC_FD_05HF.jpg](https://wiki.trevorsacks.com/uploads/images/gallery/2024-09/scaled-1680-/I0yFlXAB9cynYrvs-pinoutteac-fd-05hf.jpg)](https://wiki.trevorsacks.com/uploads/images/gallery/2024-09/I0yFlXAB9cynYrvs-pinoutteac-fd-05hf.jpg) [![800px-26_34_adapt.jpg.0d05dc1a36b56b57bfb8d3ee571bb501.jpg](https://wiki.trevorsacks.com/uploads/images/gallery/2024-09/scaled-1680-/OO6pCspJpMu6NxLY-800px-26-34-adapt-jpg-0d05dc1a36b56b57bfb8d3ee571bb501.jpg)](https://wiki.trevorsacks.com/uploads/images/gallery/2024-09/OO6pCspJpMu6NxLY-800px-26-34-adapt-jpg-0d05dc1a36b56b57bfb8d3ee571bb501.jpg) [![2024-04-29 17_18_49-Clipboard.png](https://wiki.trevorsacks.com/uploads/images/gallery/2024-09/scaled-1680-/0Swp5ZHkw3ArotkX-2024-04-29-17-18-49-clipboard.png)](https://wiki.trevorsacks.com/uploads/images/gallery/2024-09/0Swp5ZHkw3ArotkX-2024-04-29-17-18-49-clipboard.png) ## Duties Map the physical floppy drive to usb ## Parts - TEAC FD-335HF 26-pin floppy drive - Arduino Compatible Microcontroller ## Drive References | Pin | Signal | Pin | Signal | |-----|--------|-----|------------------| | 1 | +5V | 2 | Index | | 3 | +5V | 2 | Drive Select | | 5 | +5V | 2 | Disk Change | | 7 | NC | 2 | Ready | | 9 | HD OUT | 2 | Motor On | | 11 | NC | 2 | Direction Select | | 13 | NC | 2 | Step | | 15 | GND | 2 | Write Data | | 17 | GND | 2 | Write Gate | | 19 | NC | 2 | Track 00 | | 21 | NC | 2 | Write Protect | | 23 | GND | 2 | Read Data | | 25 | GND | 2 | Side One Select | # LCD - Built-in Display ## Path One: Keep the current LCD ### Duties If recycling the current LCD, will need to ensure proper power is available and do one of two things: - Convert the video signal from HDMI to 4-bit monochrome LCD signal - Write a driver that is similar in structure to SPI/I2C framebuffer to output compatible signal ### Pros - Less hardware to purchase - Keep original aesthetic ### Cons - Difficult to get awkward and high voltages to run CFL backlight - Have to reverse engineer old 4-bit signal standard (Documentation is minimal, but looks to be comparable to VGA) - Writing a *god damn* video driver ## Path Two: Use a new LCD ### Duties If using a new off-the-shelf LCD, will need to find something that will fit inside of the current case. - Curent screen: 4:3 ratio, 9.5" diagonal, 7.6" width , 5.7" height - 16:9 screen: 11.6" diagonal, 10.1" width, 5.7" height - 16:10 screen: 10.8" diagonal, 9.1" width, 5.7" height ### Pros - Much easier to just use HDMI/VGA and 12v power - Brighter, easier to see - Color! ### Cons - Damn near *impossible* to find modern LCDs that are the proper size - Will need to make custom mounting hardware for the screen - Price of a new LCD is *slightly* more than I'd like to spend # VGA - Video Output # PCI - Parallel and Serial Ports ## Duties Make available the original type of ports the original device had, in roughly the same positions These ports consist of: - 1 Parallel Port - 1 External 9-pin Serial Port - 1 Internal Serial Port, for the modem ## Parts While still undecided, some candidates are available. - ASIX MCS9901 PCIe to Dual Serial and Single Parallel Controller - Prolific PL2303GC USB to Full UART IC - Prolific PL-2303HX USB-Serial Bridge - WCH CH340 USB-Serial chip # MDM - Bluetooth Modem ## Duties Have a way to allow the computer to "dial in" to a network using bluetooth, and a OpenWRT "base station". Optionally, have the board be designed to use a similar connector, layout, and size of the original modem, so that this part can be used by others with compatible boards. ## Parts - HC-05 Bluetooth to Serial Port module # USB - USB Hub and Devices