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Hey guys, I'm running RT-11/V4 in SIMH. Is there a way to reset the backspace key to emit a proper 0x7F delete? -Thom

Has somebody put together notes or a table on matching throttle speeds to approximate CPU speeds of DEC systems for SimH? I know it's not exact, but am curious as to just how accurate we can get? -Thom

In this #retrocomputing #archaeology series video, we show how the tools at #ATARI coin-op worked, in-context. We modify Centipede, assemble, link, and create new EPROMs with our changes. #retrogaming #gamedev

In this RE-RECORDED #retrocomputing #archaeology series video, we show how the tools at #ATARI coin-op worked, in-context. We modify Centipede, assemble, link, and create new EPROMs with our changes. #retrogaming #gamedev

Demo video:

@Al Kossow welp, something actually came of this :) Thank you. :) As it turned out, I was able to build the assemblers, and their linker, and combine it with the centipede coin-op in the historicalsource github repo, and was able to build identical roms to production units. :) Thanks to Jim...

_WOW_ these were the macros that were used in coin-op! I never thought I'd see these! Thanks! :) -Thom

necro-bump, I am also looking for either a macro set or a cross-assembler for 6502 that runs on e.g. RT-11, as well...

To boot this, you need a system with: SCP 8086 CPU card SCP 8086 CPU Support card (the console serial port is also on this card) at least 48K of RAM A Cromemco 4FDC (or 16 or 64) with the RDOS EPROM disabled. Set up for 3740 format single density At least one compatible disk drive. -Thom

FWIW, the '$' as string terminator for output goes all the way back to operating system code on the PDP-6, which made its way into OS/8 on the PDP-8, which, CP/M imitated much of its behavior..so.... -Thom

Yes. It is there. I show it in the (%#@%)#@ video. :) see here: https://forum.vcfed.org/index.php?threads/earliest-known-copies-of-86-dos.1246146/post-1359158 I swear, it's like people refuse to listen or read, or something. :) -Thom

Precisely. and 86-DOS/PC-DOS/MS-DOS was substantially cheaper for a system vendor to license.

For us, it definitely is. But there is this persistent (like herpes) anecdote that 86-DOS stole code from CP/M. Even after being cited in multiple reverse engineering court cases over the last 40+ years... ...even after having BOTH 86-DOS _AND_ CP/M 2.2 ON #@(%$#@)% GITHUB... ...where you can...

I should have addressed this in the video. darn :) -Thom

I have made an in-depth video showing how 86-DOS was used in context, in this case, to port a piece of Z80 code to 8086, and getting it from CP/M into 86-DOS to run. It shows the compatible API choices that allow this to happen with nothing more than an instruction translation, and spends a bit...

This video shows the process of doing #gamedev using other, larger systems to develop software for the #Atari 2600 and 5200 game consoles using a cross assembler. This example contrasts a cross assembler from Sorcim running on #Atari8bit and #S100 hardware. Enjoy. #retrocomputing #retrogaming

This video gives an in-depth look at what is currently the oldest known copy of 86-DOS, the antecedent to #MSDOS aka #PCDOS, where we go through the process of moving from CP/M, translating Z80 to 8086 code, and assembling it. Since this DOS predates the IBM PC, it must be simulated via #SIMH as...

Hi. I am trying to put together a comprehensive series of videos on how game cross-development for consoles was done in the early 1980s, and am looking for a Frob development system, which consists of a Romulator, an EPROM burner, assembler, and monitor. I know at least one person in our...

This was a very common thing to do in software shops, but I'm wondering if anyone kept their macros for e.g. 6502 to be used with a macro assembler like DRI MAC? This is because, I'm putting together production notes for a video showing how cross system development was done professionally. -Thom

That's a really complicated question, actually. There was an attempt to do this (but using it causes massive filesystem corruption), and the listing for that BIOS is here...