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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...

Hello, As known, Norton Utilities v8.0 required 286 processor to run. If you try to run it on XT-class machine you got error: "This program requires at least a 286 CPU" and program closed. Remembering the successful launch WOLF3D on NEC V20 with simple patch 286 detection procedure, I decided...

Hello, Some days ago i connect YM2149F sound chip to PC through USB. Demo records: https://soundcloud.com/tronix286 I used old PIC16F628A DIP-18 without hardware USB to meet the AY era -) Firmware based on 16fusb library - software USB implementation for pic16 with some changes: - removed...

BTW, someone with the nickname Profesor_lampochkin in one Russian-speaking forum posted circuit and software for connect cassette tape recorder to LPT port. Download: http://www.lozkomsomol.narod.ru/cas_prg.rar Circuit is simple: LPT ┌─────────────────0 Line Out (PC side)...

Hello, I want to introduce my simple DRAM memory tester based on PIC16F73 microcontroller. Possible replacement: PIC16F870, PIC16F873 and PIC16F876. DRAM tester can test 4164 (565RU5 exUSSR) and 41256 (565RU7 exUSSR) DRAM IC. Tester has two working mode: "simple LEDs" and "advanced UART"...

Hello, Today i found old 386 board based on OPTI 82C495XLC chipset without EEPROM chip. But i found sticker around EEPROM panel: BIG photo So, at internet i found two bioses for this chipset: 1) http://chukaev.ru54.com/bios/3opm002.zip - AMI BIOS for 82C495XLC. I born into 27C512 and when...