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MCLZ8 project, (fast) Z80 replacement

by lintweaker on 20-01-2023, 13:18
Score: 200.38 %, Type: Forum topic , Comments: 10 comments
are possible. It supports a few different modes where mode 0 gives a cycle accurate Z80. Other modes provide ... 10 time=0 20 k=0 30 k=k+1 40 a=k/2*3+4-5 45 gosub700 50 ifk<10000thengoto30 60 ?time:end 700 return Relative performance using the MCLZ8 various accelerator modes: M0 - all memory access uses ...

V9990 hw issues

by lintweaker on 30-07-2021, 17:20
Score: 182.56 %, Type: Forum topic , Comments: 7 comments
Quite a while ago I was able to obtain a single V9990 chip and only one of them. As I am not familiar with it and I only have one I decided to build a V9990 module so I can re-use if needed. The module itself and the card for my DIY MSX to test it ...

Updates to MegaReport v1.3 wanted?

by lintweaker on 27-01-2021, 17:00
Score: 177.56 %, Type: Forum topic , Comments: 6 comments
I'd like to start this thread to get an idea if there is interest in an fixed and or updated MegaReport. I've managed to get all my sources and make it build and run again. Ideas: - First release a quick update to v1.3 which can ...

For some retro fun: new SCSI interface

by lintweaker on 10-07-2020, 11:22
Score: 172.66 %, Type: Forum topic , Comments: 0 comments
For the next iteration of my DIY MSX (Z8TY) I thought let's try to make a MSX compatible SCSI interface, so if it works I can maybe integrate it on the next motherboard PCB version. It uses a WD33C93A SCSI controller as used on a few ...

MSX Club Gouda SCSI interface schematics / PCB layout

by lintweaker on 27-06-2020, 11:40
Score: 172.62 %, Type: Forum topic , Comments: 5 comments
For fun and historical purposes I have reproduced the schematic for the MSX Club Gouda SCSI interface and PCB (approximation only). I noted some oddities in the schematic PDF. https://github.com/lintweaker/msx-scsi Notes: - the 50-pin IDC ...

Ascii 8kb mapper, confused

by lintweaker on 24-06-2020, 12:11
Score: 172.51 %, Type: Forum topic , Comments: 6 comments
if the pages are Except if the pages are defined by software from the page 0. Nextor do it. Okay, ...

Programmable IO waitstates experiments

by lintweaker on 16-05-2020, 15:08
Score: 171.76 %, 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: 171.77 %, 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: 171.07 %, 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: 174.6 %, 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 ...
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