uzix/zx-sizif-128
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Eugene Lozovoy
2022-07-10 10:33:45 +03:00
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README.md
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@ -4,6 +4,9 @@ Easy-to-build minimalistic ZX Spectrum clone.
[![photo](images/revB.small.jpg)](images/revB.jpg?raw=true) [![photo](images/revB.small.jpg)](images/revB.jpg?raw=true)
[(some random photos)](https://cloud.err200.net/index.php/s/73TR85tYZkMm8Ax?path=%2Fsizif-128)
Specifications: Specifications:
- CPLD EPM7128SLC84 (128 macrocells) - CPLD EPM7128SLC84 (128 macrocells)
- Z80 3.5 MHz - Z80 3.5 MHz
@ -14,8 +17,21 @@ Specifications:
- Intended to build on 9x15 prototyping board, but may be built on manufactured PCB - Intended to build on 9x15 prototyping board, but may be built on manufactured PCB
To modify and compile CPLD firmware you need Quartus 13.0sp1. To modify and compile CPLD firmware you need Quartus 13.0sp1.
To modify schematic and pcb you need Kicad 5.1.4 or newer. To modify schematic and pcb you need Kicad 6 or newer.
Please note the [errata](pcb/rev.A/ERRATA.txt) for rev.A pcb. ### Changelog
* Rev.A - first release. Please note the [errata](pcb/rev.A/ERRATA.txt).
* Rev.B - experimental PCB
* 74HCU04-based tape input
* added power LED
* added reset button
* removed NMI button
* C20 replaced by variable variant to tune PAL color signal
* Rev.C
* 74HCU04-based tape input reverted back to transistor-based
* unused U6 inputs has been grounded
* video circuit has been tuned for best colors
* all pcb tracks are fancy now ;)
* Rev.C1
* improve tape input sensitivity (thanks to SerOne from zx-pk forum)
[Some photos](https://cloud.err200.net/index.php/s/73TR85tYZkMm8Ax?path=%2Fsizif-128)