UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Infotron TL78-02-29 (PN 170152) 26KB Computer (6502A) Board

Pernod70 · 21st Nov 2022, 1:01 pm

I created a simple machine with the ROMs in MAME:
RAM: 0x0000-0x3FFF
ROM: 0xD800-0xFFFF (0xDA00-0xDFFF is empty ROM sockets)

When running it tries to setup some unknown IO at 0x9000-0x9007, maybe serial port(s), one of which is likely expecting a terminal, but I didn't recognise the data being sent to determine the type of ACIA/UART device at these addresses.

If I force it through this initial setup then it'll continue to enable interrupts and happily loop waiting for something to happen.

As there's text in the ROM I was hoping to maybe see it write something to video RAM so that I could get it to display something, but looking more likely that it's writing anything to be displayed via serial to a terminal.

21st Nov 2022, 1:01 pm	#2
Pernod70 Triode Join Date: Nov 2022 Location: Croydon, Surrey, UK Posts: 37	Re: Infotron TL78-02-29 (PN 170152) 26KB Computer (6502A) Board I created a simple machine with the ROMs in MAME: RAM: 0x0000-0x3FFF ROM: 0xD800-0xFFFF (0xDA00-0xDFFF is empty ROM sockets) When running it tries to setup some unknown IO at 0x9000-0x9007, maybe serial port(s), one of which is likely expecting a terminal, but I didn't recognise the data being sent to determine the type of ACIA/UART device at these addresses. If I force it through this initial setup then it'll continue to enable interrupts and happily loop waiting for something to happen. As there's text in the ROM I was hoping to maybe see it write something to video RAM so that I could get it to display something, but looking more likely that it's writing anything to be displayed via serial to a terminal.