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Programmable IO waitstates experiments

by lintweaker on 16-05-2020, 15:08
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?

by lintweaker on 13-05-2020, 17:07
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?

by lintweaker on 19-04-2020, 10:07
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

by lintweaker on 13-04-2020, 11:38
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?

by lintweaker on 04-04-2020, 13:19
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 ...
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