gekkio / gb-research Goto Github PK
View Code? Open in Web Editor NEWGame Boy hardware research
Game Boy hardware research
First of all thank you for your hard work reverse engineering the SM83.
I encountered an issue with irq_ack
:
irq_ack
goes high during cycle int_s110
. This means it goes high when PHI is high.
irq_latch
is latched when PHI is high. This makes sense because PHI stays high when the CPU is halted.
The issue is that this way irq_ack
acknowledges the IRQ when PHI is high and so irq_latch
immediately goes low before the address is read during writeback
. It will always jump to address $0000.
Most likely it should be like this:
irq_ack <= irq_prio and int_s110 and writeback;
This way it acknowledges the IRQ when PHI is low and irq_latch
has stopped latching.
PS irq_prio
is a logic vector and int_s110
is a single logic signal. It is strange that these can be simply ANDed together. VHDL is usually very strict.
Hello there !
Can you tell me what the diference between MGB-CPU-01 and MGB-ECPU-01 motherboard ?
I know LCPU mobo add the LED and change power board layout in second revision, but ECPU doesn't really look different from the first MGB-CPU-01 motherboard.
Have you the clue ?
Thanks ;)
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.