Some time ago I made a small and very basic 68000 computer.
Simple as it was, that whole process was incredibly satisfying and it lead me to start putting together a design of something that would be more like a real and usable computer.
I call it Raven.
It's not nearly as posh as that other bird from Atari
More details can be found on Github: https://github.com/agranlund/raven
It's still in bring-up phase but this first prototype has shown enough promise that I think it deserves a build blog.
There will eventually be a second/final revision based off notes I'm collecting from getting everything on this one tested.
This is the status of the machine as of today:
The specs of prototype A0:
68060 CPU, 48MB RAM (max), 16MB ROM (max)
High speed serial, Legacy serial, Legacy parallel
YM2149 sound, Battery backed clock
Eiffel for keyboard+mouse+joysticks
Audio in/out, Midi in/out (TRS Type-A)
4x ISA expansion (16bit)
It's never intended to be a 100% hw compatible computer - just enough to run the OS friendly stuff.
There's YM and MFP onboard mapped to the normal Atari locations which helps of course.
Longer term, I'd like to explore using my CaSTaway port for running ST games on it by help of (partial) software emulation.
But really, the main goal is just to have fun making my own computer.
I'm basically treating this as a one-off for me, though all the stuff will go to Github once it's past prototyping if someone else wants to build one.
(This probably reflects on the design. I'm sure if someone where to make some kind of product meant to compete with existing stuff they would make different design decisions)
Raven. A homemade Atari-like computer
Re: Raven. A homemade Atari-like computer
And some older pictures of, for me, quite exciting stages
Kicad
Boards arrive and test fitting in the intended home:
Verifying reset and power-on stuff:
Some different RAM+ROM modules and the ROM programmer:
Freerunning the CPU
Beginning of bios and first text output from the computer
EmuTOS over serial connection
Kicad
Boards arrive and test fitting in the intended home:
Verifying reset and power-on stuff:
Some different RAM+ROM modules and the ROM programmer:
Freerunning the CPU
Beginning of bios and first text output from the computer
EmuTOS over serial connection
Re: Raven. A homemade Atari-like computer
It's almost like the Milan 060 which never was
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
- mrbombermillzy
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Re: Raven. A homemade Atari-like computer
My goodness! This is amazing!
- rubber_jonnie
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Re: Raven. A homemade Atari-like computer
WOW!!!
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
- chronicthehedgehog
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Re: Raven. A homemade Atari-like computer
Wow. Its a work of art.
- HigashiJun
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Re: Raven. A homemade Atari-like computer
Well done !
Can we expect an official release soon ?
Can we expect an official release soon ?
Re: Raven. A homemade Atari-like computer
ROM SIMMS? You're a madman!
I love it. Great work.
BW
I love it. Great work.
BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
Re: Raven. A homemade Atari-like computer
That, and deciding to go with custom RAM Simms, greatly simplified routing on the mainboard
(though routing this thing was still by far what took the longest)
Also, I just think it looks awesome with those custom simms in matching color...
All the Simm slots have exactly the same pinout and each have 16MB physical address space for simplicity.
The boot bios enumerates what's actually installed and maps it to linear ST-RAM, TT-RAM and OS-ROM in the usual Atari location.
It does a bit of other setup too and then jumps to $E00000
Same for the YM and MFP. Their physical addresses are actually not in Atari locations but placed such that the boot bios can easily map them there on startup.
This greatly simplifies the physical address decoding, and more importantly the amount of address signals needed to be routed to the ATF1508.
It's all in the spirit of "go with what's easiest for Granlund"