Allow navigation with Joystick in the menus

• Up
• Down
• Fire => Select
• Left => Back (BREAK or Joystick button 2)

Entering the menu with USR and then pressing USR again hangs the Spectrum. (Reset works)

MP2233DJ (the IC used for the power supplies) is now marked as Obsolete by LCSC. The part is still available on Mouser, but stock is relatively low, and price a bit high (we need two per board).
Alternatives should be found in antecipation of the IC leaving market.

+2A/+3 spectrums have an extra ROMCS line present on the connector A15. This pin is also used for video out on other models. Allow this line to be driven low by the FPGA.

Support grabbing the screen content, either with the USR menu (omitting the menu) or using a custom key on a USB connected device. Save the screen to a predefined path either on the SD Card or a USB mass storage device.

Seems like there are some missing files in esp32/host/QtSpecem

Also shouldn't qmake --qt=5 be qmake-qt5?

The casette.png file is missing from the repo.

Add support for generating the CPU clock. This is useful to run spectrums without ULA. As per schematics, the CK pin is connected to the base of a transistor driver.

Use a buffer/inverter with OE control to drive the CK line with 5V logic.
This may require freeing up a few FPGA pins. Suggestion is:

• Disconnect USB_SUSPEND and tie the PHY suspend to 0. We don't use it at the moment.
• Redirect USB_FLT into an unused CLK input pin. Synthesis tests show this is possible.

Design the main structure of the web interface.
The main web interface will be stored inside a "spiffs" filesystem. A preliminary version can be found inside "esp32/spiffs".
The interface shall have multiple tabs, one for each major area. All pages shall be static, dynamic content will be fetched using AJAX.

The current rightmost LED area has the LEDs quite close to each other, which makes it difficult to have openings on the case.

Separate the LEDs by 5mm. This will ensure proper clearance.

$ make -C host
make: Entering directory '/home/rickardvonessen/src/ZXInterfaceZ/esp32/host'
cc -O2 -g -Wall -Wextra -DIDF_VER=\"0.1\" -I/home/linuxbrew/.linuxbrew/Cellar/glib/2.62.4/include/glib-2.0 -I/home/linuxbrew/.linuxbrew/Cellar/glib/2.62.4/lib/glib-2.0/include -I/home/linuxbrew/.linuxbrew/opt/gettext/include -I/home/linuxbrew/.linuxbrew/Cellar/pcre/8.43/include -I./FreeRTOS/Source//include -I./FreeRTOS/Source//portable/GCC/Linux -I./FreeRTOS/ -Iesplayer -I. -I/home/alvieboy/Temp/esp-idf//components/esp_system/include/ -I/home/alvieboy/Temp/esp-idf//components/soc/soc/esp32/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_common/include/ -I/home/alvieboy/Temp/esp-idf//components/spi_flash/include/ -I/home/alvieboy/Temp/esp-idf//components/soc/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_event/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_wifi/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_timer/include/ -I/home/alvieboy/Temp/esp-idf//components/fatfs/vfs/ -I/home/alvieboy/Temp/esp-idf//components/fatfs/src/ -I/home/alvieboy/Temp/esp-idf//components/wear_levelling/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_netif/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_eth/include/ -I/home/alvieboy/Temp/esp-idf//components/spiffs/include/ -I/home/alvieboy/Temp/esp-idf//components/mbedtls/mbedtls/include -I/home/alvieboy/Temp/esp-idf//components/app_update/include/ -I/home/alvieboy/Temp/esp-idf//components/bootloader_support/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_http_client/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_http_server/include/ -I/home/alvieboy/Temp/esp-idf//components/esp_http_server/src/port/esp32 -I/home/alvieboy/Temp/esp-idf//components/esp_http_server/src/util -I/home/alvieboy/Temp/esp-idf//components/nghttp/port/include/ -I/home/alvieboy/Temp/esp-idf//components/nvs_flash/include/ -I/home/alvieboy/Temp/esp-idf//components/tcpip_adapter/include/ -I/home/alvieboy/Temp/esp-idf//components/driver/include/ -I/usr/include/cjson    -c -o ../main/aplist_resource.o ../main/aplist_resource.c
In file included from ../main/aplist_resource.c:2:0:
../main/fpga.h:5:24: fatal error: esp_system.h: No such file or directory
compilation terminated.
<builtin>: recipe for target '../main/aplist_resource.o' failed
make: *** [../main/aplist_resource.o] Error 1
make: Leaving directory '/home/rickardvonessen/src/ZXInterfaceZ/esp32/host'

Also while building the file esp32/sdkconfig gets modified. Should this file be committed to the repository?

The current placement for the ZX Spectrum connector is good if no case is used. If we place the board in a case, it's difficult to fully insert the interface into the ZX Spectrum.

Move the connector 3mm outwards. This should allow for the interface to completely insert into the expansion connector.

See and set connection status, signal strength, IP, netmask, etc

todo

YM2149 sound should be silenced upon NMI, otherwise it will make awful, unwanted noise. Configured volumes should be restored at NMI exit (but not for SNA load).

$ make flash                                                                                                              
fatal: No names found, cannot describe anything.
Toolchain path: /home/rickard/.espressif/tools/xtensa-esp32-elf/esp-2020r2-8.2.0/xtensa-esp32-elf/bin/xtensa-esp32-elf-gcc
Toolchain version: esp-2020r2
Compiler version: 8.2.0
Python requirements from /home/rickard/src/esp-idf/requirements.txt are satisfied.

App "esp32_interfacez" version: d416435-dirty
GEN fpga.bin
make: ./filesize: Command not found
make: *** [Makefile:16: fpga.bin] Error 127

I can't find any ref other ref to filesize.

See and set connection status, signal strength, IP, netmask, etc

The current pullup on IO2/SDMMC_D0 interferes with serial bootloader and makes it impossible to program the ESP32 via serial USB port.

This pullup should be connected using MOSFET as we already do for SDMMC_D2/IO12.

It would be great to have audio/video output via HDMI. It's a more future prof connection than VGA + Analog audio.

Detailed design and implementation of POSIX file interface.

• Support commands for POSIX file operations in spectcmd.c
• Support RST$08 interface for Spectrum interfacing.

This will need a file handle interface to separate ESP32 handles from Spectrum handles. To be understood if we also need some sort of driver infrastructure.

API should implement equivalent methods for the following POSIX functions:

• getcwd
• chdir
• open
• close
• read
• write
• opendir
• readdir
• closedir
• ioctl
• fcntl

The directory handles are still TBD, because we need to map those to the internal ESP32 directory handles as well.
The DEVELOPMENT document shall be updated to include detailed information about the command API.
The SPECTRUMAPI document shall be updated to include the RST$08 API.

Currently not working

If you case insensitive filesystem (macOS, Windows 10) you get problems checking out this repo. Maybe we can rename the link freertos a bit.

A few issues have been spotted with the included VGA/Audio adapter in revision 2.2.

• The audio jack is too close to the VGA connector, making it impossible to connect both at same time except with a very narrow male jack.
• The ESP32 causes voltage drops on the 3.3V line whenever it transmits, and this causes the buffers to output lower than expected voltages, leading to audible noise on the audio output.

Report the version determined from git describe --tags --dirty on the web UI's status page and on the serial console.

Some spectrums (notably some early toastrack) do not route the CLK signal to the expansion connector, however we currently rely on CLK for de-assertion of the WAIT signal for proper synchronization.
To be investigated. Might need a DPLL in order to generate a fake clock signal we can use.

As I understand(I might be wrong) - this device uses ports #3, #5, #7 etc.

Main issue of this solution that it makes device totally incompatible with ZX Spectrum 128K and later(+2/+2A/+3/128K compatible computers) - cause IORQULA block only #FE port and doesn't block AY's ports, memory management unit, disk and printer ports(on +3).

Main issue that original ZX SPECTRUM machines uses bit mask decoding of port instead full address decoding.

You should use ports that didn't cross with audio ports, memory ports, +3 FDC and internal cetronics port of +2A/+3.

Information about bit masks present here: https://www.worldofspectrum.org/faq/reference/ports.htm

Thank you for your work!

I wish you can make it best!

We could use HTML5 pushState or replaceState to fix this.

My usual linux laptop just dead so I've cloned repo from macOS - there was collision between both files(same issue will get all windows users and some linux users).

I've solved it by creating case sensitive volume but not everyone will make it(btw, some linux users using case insensitive mode of ext4 file system).

I recommend rename LineBuffer.h to LineBuffer.hpp that will solve this issue at all.

When restoring 48K SNA on a 128K machine, the correct ROM should be selected prior to resuming SNA execution.

Switch to pull-pull SD card socket.

P/N: Molex 503398-1892

• Logo
• Custom theme and branding
• Wifi configuration
• Fix unit test
• Fix icons
• Strip unused Icons and bundle icons and fonts
• Add some simple e2e tests
• Serial log in web UI

Power supply needs changing because +2A/+3 do not use +9V rail. Power through +5V is +9V is not available.

Add a diagnostics ROM that can be automatically loaded via a button or by enable it in the web interface etc. To allow the IfZ to be used to diagnose Spectrums with hardware issues.

Retroleum's Diagnostics ROM:

http://blog.retroleum.co.uk/electronics-articles/a-diagnostic-rom-image-for-the-zx-spectrum/

NC3/B4 should connect to the FPGA as it is a second ROMCS for 128K.

Currenlty the API /req/wifi returns

{
  "mode" : "ap", 
  "sta": {
   	"ssid": "ssid",
        "hostname": "interfacez", 
        "ip": "dhcp", 
        "netmask": "255.255.255.0", 
        "gw": "127.0.0.1", 
  },
  "ap" : {
   	"ssid": "ssid",
        "hostname": "interfacez",
        "channel": 1,
        "ip" : "127.0.0.1",
        "netmask" : "255.255.255.0",
        "gw" : "127.0.0.1"
  }
}

Where ip: dhcp but I think it would be better to add "dhcp": true, "ip": "<currently leased IP>".

When requesting a non existing path /req/list?path=<non existing path> the API returns 500 Internal error but it should return 404 Not Found.

Add small overlay support for suitable video modes. This overlay should be a framebuffer with some sort of alpha channel.

The current video RAM capture memory is 8192 bytes. 6912 bytes are needed for the Spectrum framebuffer, leaving 1280 bytes available for the overlay.
Using RGB332 (8bpp) we can have either:

• 160x8
• 128x10
• 106x12

For alpha support. it should eventually be fixed or a color with alpha shall be defined for the background only.

The framebuffer shall only be accessible by ESP32, not spectrum.

48.ROM isn't included in the all target and depend on zx-spectrum-rom.asm which is missing.

Building roms fails with:

cd roms; make
make: *** No rule to make target 'videomode.asm', needed by 'INTZ.ROM'.  Stop.

Add support for POK files.

More information here: https://worldofspectrum.net/sgd.html
https://worldofspectrum.net/assets/POKformat.txt

Auto-load pokes if file matches SNA name.
This needs a menu so user can choose the Trainer

In the esp32/Makefile target flash depends on resource.bin.

$ make resource.bin
Toolchain path: /home/rickardvonessen/.espressif/tools/xtensa-esp32-elf/esp-2020r2-8.2.0/xtensa-esp32-elf/bin/xtensa-esp32-elf-gcc
Toolchain version: esp-2020r2
Compiler version: 8.2.0
Python requirements from /home/rickardvonessen/src/esp-idf/requirements.txt are satisfied.
make: *** No rule to make target 'resource.bin'.  Stop

The current surface-mount microUSB can easily become loose from the board. Convert it into a through-hole (mixed) part for robustness,

Allow games/software to be loaded (almost) instantly.

There seems to be an issue with the bounding box of the logo, also the font size seems a bit large so the two lines overlaps each other.

https://github.com/alvieboy/ZXInterfaceZ/blob/74c2d986af282f201460911643a19f21287ce3bd/interfacez-logo.svg

(Also there was both logo.svg and interfazez-logo.svg with the same sha256 sum, I'll drop the later)

Support 2x DSUB 9-pin Kempston (Port 31) joystick interfaces. It is possible to support 2 fire buttons and to have a small amount
of power available on pins 5 and 7 for joysticks that require it (EG: Megadrive pads).

In order to use host mode, D+ and D- lines should have a 15KΩ pulldown to ground.

Even if there are USB devices connected.

Allow recording of external tapes (connected via spectrum EAR) to TAP or TZX.

Currently nWAIT line is not driven, but we need to use it for simultaneous RAM access by the ESP32 and spectrum. A driver for this line should be added and connected to FPGA.