Recent content by Tronix

BTW source code for Pi Pico here: https://github.com/Tronix286/tsound .

Draft circuit in attachments

I just finished making a Qbus-compatible device using a pi pico - it's a simple sound card for the Soviet clone of PDP 11 named UKNC-0511 and the MPI 16-bit bus, which is a clone of the QBus , I assume. Pi pico emulates a pair of AY-3-8910 PSG chips plus covox (8 bit DAC). The sound is output...

Finaly i fixed it. There was a break in two traces on the board - A13 and A15 from CPU to 74LS373 latch that generates signals ISA_A13 and ISA_A15. Now i running DOS with VGA video (Realtek 3105) and XT_IDE. Passed extended memory tests in CheckIt. The board also works with all my VGA, CGA, MDA...

Yes, sure, this is realtek 3105 that works with other xt. I have another XT-clone motherboard on which I tested all the video cards that I try to use in this system. They all work perfect with a different XT board. I have tested: old CGA with descrete IC from 1980, newly made CGA with descrete...

Hello, I recently got this motherboard (photo by seller): I identified the board as AUVA COMPUTER 8088 TURBO TXM/10-III . I washed the board from dust and dirt, straightened the jumper contacts and installed the jumpers of the eeprom type selection in accordance with the description to 2764...

So, i desolder one EPROM from main board with strange marking: I dumped it with help programmer as 2716. Dump in attachment.

Hello, is it possible with INT 1 (single step)? By installing our own handler, we can learn the following opcode. Something like this: http://ivanlef0u.fr/repo/madchat/vxdevl/vdat/tudf0001.htm What do you think about it?.

Hello all and happy new year! This is my "weekend project" - ISA XT-SD controller. I know about the existence of XT-IDE and IDE-SD adapters. Therefore, there is no problem to use SD card on XT. This project is just a hobby, no more. So, main idea - use small CPLD for SPI bits shifting: On...

Searching Windows 3.0 Driver Development Kit (DDK)....

Hello, Need some help from people who know how AY-3-8910 and SAA1099 PSG chips work and who have some expirience in Z80 assembler. I read this article: http://www.worldofsam.org/node/670 - describe how play YM2149F music over Sam Coupe computer (contain one SAA1099 chip). Unfortunately, this...

Hello, Looking for keyboard pinout and protocol description, presumably from Videoton terminal: I want to connect it to modern PC with help microcontroller converter. Thank you.

Hello, I'm looking for a BIOS with this video card: This video-card is similar to this one: http://www.vgamuseum.info/index.php/cards/item/498-video-seven-l1a4199 and this card: http://www.minuszerodegrees.net/rom/rom.htm (VGA-16E) Both links contain a BIOS firmware (v1.09 and v1.14). But...

Hello, I read about Creative Music System (CMS) / Game Blaster at Great Hierophant blog. This sound card based on two Philips SAA1099 chips and looks easy to duplicate. Easier than adlib: SAA1099 data lines to ISA data lines, A0 to ISA A0, Vref through 10K resistor to VCC, DTACK (open collector...