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Programmable IO waitstates experiments
Score: 165.19 %,
Type: Forum topic , Comments: 7 comments
I have programmed a CPLD to insert additional waitstates to the Z80 to slow down I/O access. The additional waitstates can be set from 0 (disabled) to 255.
As a test I just let the Z80 run on 10MHz and play with number of needed extra waitstates to get a properly working screen.
Some findings I can use ...
HBI-900 manual?
Score: 165.2 %,
Type: Forum topic , Comments: 14 comments
I finally got my Sony HB-F900 and HBI-900 combo complete, yeah!
Is there a manual of sorts available somewhere?
I can now mix 2 (computer) images and switch between the two. The middle 8 buttons light up when pressed but do not seem to have any ...
Turbo-R cpu soft switch: how does it work?
Score: 164.5 %,
Type: Forum topic , Comments: 12 comments
As we all know the Turbo-R can switch CPUs mid program and continue the currently running program with the alternate CPU.
I am trying to wrap my head around how the CPU being switched to can continue at the same RAM/ROM address? I know the registers ...
Little Kawasaki Z80 experiment
Score: 168.03 %,
Type: Forum topic , Comments: 15 comments
Reading about the Kawasaki Z80 (KL5C8400) here on the forum I decided to do a little experiment with it.
Made a board to test with on my DIY MSX:
(board on the foto still has a lot of flux residue on it)
It was a little tricky to get ...
Sony HB-F900 keyboard repair?
Score: 164.29 %,
Type: Forum topic , Comments: 8 comments
A couple of weeks ago I got my hands on a Japanese Sony HB-F900 (the black one). It is in decent condition but needs a good clean.
One of the, bigger, issues is the keyboard (KBD-13 (B) ). Most keys do not work.
I opened up the keyboard and luckily ...
