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SDCC bug?

by lintweaker on 02-10-2020, 17:56
Score: 168.93 %, Type: Forum topic , Comments: 11 comments
int i = (int)nibbles - 1; while (i >= 0) { uint16_t aux = (v >> (i << 2)) & 0x000F; uint8_t n = aux & 0x000F; if (n > 9) printf("%c",('A' + (n - 10))); else printf("%c", ('0' + n)); ...

DOS2 disk routines from BASIC, should it work?

by lintweaker on 29-08-2020, 17:08
Score: 168.01 %, Type: Forum topic , Comments: 2 comments
I am trying to read a file using the DOS2 'open file handle', 'read from file handle' and 'close file handle' from BASIC (using assembly) by calling 0f37dh. So far I only get ... tried full path (e.g. 'c:\path\to\file.ext',0) or file name only 'file.ext',0 ...

For some retro fun: new SCSI interface

by lintweaker on 10-07-2020, 11:22
Score: 166.88 %, 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: 166.83 %, 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: 166.73 %, 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: 165.98 %, 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: 165.98 %, 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: 165.29 %, Type: Forum topic , Comments: 12 comments
this out yet? https://www.msx.org/forum/dev https://www.msx.org/forum/development/msx-development/how-stuff-works-msx-tr-cpu-modes Everything is pushed on the Everything is pushed on the stack (just like the interrupt ...

Little Kawasaki Z80 experiment

by lintweaker on 13-04-2020, 11:38
Score: 168.82 %, 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 ... compatible CPU? https://www.msx.org/forum/msx-talk/hardware/fast-z80-rabbit Did someone ever ...

Sony HB-F900 keyboard repair?

by lintweaker on 04-04-2020, 13:19
Score: 165.08 %, 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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