Tralala 8088 Homebrew Computer Activity
Tralala 8088 Homebrew is a simple homebrew computer that can boot DOS
Status: Alpha
Brought to you by:
nickysn
Activity for Tralala 8088 Homebrew Computer
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Nikolay Nikolov committed [r196] on Code
+ 8088 bill of materials: added the Arduino LCD Screen
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* 8088 bill of materials: added link to tme.eu for the Alliance Memory SRAM chip, because they still have it in stock
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* 8088 bill of materials: the number of reset switches needed is 2, not 1
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+ added digikey links
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* fix font and formatting
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+ added bill of materials (initial version)
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* updated plot directory
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+ exported the schematic as PDF
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* updated copyright year on schematic sheets
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+ gerber export
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* prepare for fab export
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+ added drill origin and layer alignment targets
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+ added labels on the silkscreen for P4 pins
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* cleaned up the F.fab layer
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* moved some reference labels slightly for better visibility
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+ added labels for "Reset 8088" and "Reset PIC" on the silkscreen near P1 and P5
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* update date, revision and copyright years on the PCB
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* update date and revision on the schematic
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+ added value for the polyfuse
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* unify via sizes
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+ added labels on F.cu and B.cu with version and project URL
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+ added some labels on the silkscreen
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* polyfuse value added
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+ SCR part number
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* use thick traces for the OVP protection crowbar circuit
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* changed footprint of polifuse F1
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* update PCB after last schematic updates
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* microcontroller can also be PIC18F4550
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* set the value of R1
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+ connected MWTC to the flash chip, thus allowing in-circuit BIOS flashing, but added a flash write protect jumper
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+ added ROM type select jumper
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+ added ~{TEST} connector
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* moved the power indicator LED, so it doesn't clash with the IRQ connector
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* go back to 0.34 mm clearance
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+ added IRQ connector, similar to the one, on the 8086 board
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* connect A18 of the ROM flash chip, so a 512kb ROM can be used as well
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* leave more space around 7805 for better cooling or larger heatsink
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* moved the bottom mounting holes closer to the PCB edge
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* moved PIC ICSP connector closer to the PCB edge
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* moved the barrel jack closer to the PCB edge
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* replaced the two extra logic analyzer pin connectors with a single one
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* reanotate schematic
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* replaced socket P1 with a quartz
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* open source hardware logo on the PCB marked as "not in schematic". This prevents it from disappearing when updating PCB from schematic and also fixes a DRC warning.
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* changed the transistor footprints to TO-92_HandSolder: this cleans up all the remaining DRC violations (and should allow slightly easier soldering, as a bonus)
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* replaced transistor's footprints from TO-92-inline to just TO-92
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* changed mounting holes to MountingHole_3.2mm_M3_Pad
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* increase via holes to 0.6 mm diameter and vias to 1.08 mm diameter
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* increased via diameter to 0.99 mm
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* fix a lot of DRC errors
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* increased to copper to edge clearance to 3 mm
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* increase VIA drill hole to 0.55 mm, add some design rules, fix some DRC errors
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* moved the entire board to the left
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* extended board to include the entire Arduino LCD display; previously the only connector was placed in the wrong direction
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* fixed the Arduino LCD connection footprint and added labels on the silkscreen
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* fixed the PIC ICSP connector footprint, added label on the silkscreen, indicating "PIC ICSP"
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+ added "reset" labels near the reset buttons, on the silkscreen
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+ added jumper connectors in parallel with the reset buttons
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+ added power indicator LED
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* changed the value of the Zener diode
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* improvements to the power supply circuit
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+ support building the firmware for the PIC18F4550, as an alternative to the PIC18F4553
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* pic8088interface.X renamed pic_8088_or_8086_interface.X
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+ implemented PutPixel for drawing a pixel on the Arduino TFT display
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* fixed compilation with MPLAB X IDE v6.05 and XC8 v2.40
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* fixed IORC and IOWC connections to the 8259A interrupt controller. Previously they were swapped, which was a mistake in the schematic.
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* KiCad saved some changes on closing
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* moved JP1 to the right
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* moved TP1 and C10 to the left
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* moved U18 even more to the left
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* moved U18 slightly to the left
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- removed some more redundant power traces
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- removed redundant +5V and GND traces that are already connected via a copper fill zone. The reason is, they thicken the thermal relief pads and make soldering more difficult.
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* update PCB with schematic
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+ added +5V copper fill exclusion zones around the mounting holes
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+ allow building split 256k BIOS images (lo and hi) for the 8086
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+ added source of a tool for splitting a binary image into odd/even bytes
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+ also build a 512KB 8086 BIOS image
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* cleaned up unused parts of the makefile
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* clean up commented out code from the makefile
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* build a 256k 8086 BIOS image as well
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* BIOS binary renamed bios_8088_256k.bin to indicate it's for the 8088 CPU and it's for a 256k BIOS image (39SF020)
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* fixed BIOS building under Windows, using the makefile
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+ added the Tralala 8086 Homebrew Computer schematics and PCB layout
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- removed fp-info-cache
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+ added dimensions on User.Drawings
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* fixed some PCB design rules violations
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* changed footprint of U2 (it was too wide for a 8088) and fixed routing
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* fixed C15 pin ordering after schematic update
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* fixed the LED ordering after the schematic refactoring
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* update PCB with changes made to schematic
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* changed the schematic revision to 0.2, updated date
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* hw/v0.1 renamed hw/8088
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+ eol style native
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* use eol style native for the KiCad 6 schematic files
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+ initialize the 8259A programmable interrupt controller (if present). Map all interrupts to ints 78h..7Fh, mask (disable) all interrupts by default; install handlers, that print a text, containing the IRQ number
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+ initial Tralala 8086 support in the BIOS (hidden behind ifdefs)
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+ introduced constants for the PPI ports. No functional changes.
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* some more schematic tidying and cleanup
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* some cleanup to the PIC and IO schematic sheet
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