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STD Dr.Beep ZX Spectrum-PC iface
License: Public Domain
Mode: Editors' pick
Cloned from Dr.Beep ZX Spectrum-PC
A redesign of Dr Beep's project (http://trastero.speccy.org/cosas/JL/DrBeep/PC-ZX.html) for communicating a ZX Spectrum (and possibly related clones) to a PC. This redesign is based on a Raspberry Pico microcontroller instead of a PC and a paralell port
The RPi uses 8 GPIOs for I/O (D0-D7) and a SN74LVC245 as a bus transceiver, for communication with the ZX Spectrum. The rest of the logic is pretty much the same as the original design, including the ROM and the bus/port access logic, based on a few 74LSxx chips.
On this stage only the interface is presented. Two more components are needed: the uPython code to control the RPi, and the ROM routines adapted for the new interface. I expect to finish those two components, together with final tests of the board, in the next few weeks.
In the future, the project could include a Kempston joystick interface, a reset button and possibly a freeze button to allow for savestates and POKEs. Keep tuned for more news!
ID | Name | Designator | Footprint | Quantity |
---|---|---|---|---|
1 | Capacitor 0.1 uF | C2,C3,C4,C5,C6,C7 | 0.1UF, 50V CAPACITOR | 6 |
2 | ZX Spectrum Edge Connector | CON1 | ZX SPECTRUM EDGE CONNECTOR (VERTICAL) | 1 |
3 | 1N4148 | D1 | DO-1N4148 | 1 |
4 | 1x3 PinHeader | JP1 | HDR-M-2.54_1X3 | 1 |
5 | 4.3K | R1 | AXIAL-0.3 | 1 |
6 | Toggle Switch SPDT Red 3 Pin ON-OFF-ON 3 SPDT Small AC 6A/125V 3A/250V | SW1 | TOGGLE SWITCH SPDT RED 3 PIN ON-OFF-ON 3 SPDT SMALL AC 6A/125V 3A/250V | 1 |
7 | RASPBERRY-PI-PICO | U1 | FT_RASPBERRY-PI-PICO_TH | 1 |
8 | 27C256 | U2 | DIP28-600 | 1 |
9 | 74LVC245 | U6,U7 | 74LVC245 | 2 |
10 | 74LS04 | U3 | DIP-14_L17.8-W10.2-P2.54-BL | 1 |
11 | 74LS32 | U4 | DIP-14_L17.8-W10.2-P2.54-BL | 1 |
12 | 74LS27 | U5 | DIP-14_L17.8-W10.2-P2.54-BL | 1 |
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