Search results
SDCC bug?
Score: 169.42 %,
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?
Score: 168.49 %,
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
Score: 167.37 %,
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
Score: 167.32 %,
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
Score: 167.21 %,
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
Score: 166.47 %,
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: 166.47 %,
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: 165.77 %,
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: 169.3 %,
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: 165.56 %,
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 ...
