Looking for MOTOROLA AN-853 Application Note - 6805 Emulator Design - Page 1
Forum section: electronics / general

author: marcopolo
author_rank: Regular Contributor
timestamp: August 25, 2024, 09:35:45 am
content: Hello,I'm looking for the MOTOROLA application note AN-853 for the 6805 MCUTopics covered:- M146805 Emulator Design Considerations- ROM Emulation- I/O Emulation- Interrupt Emulation- Oscillator emulation- MC146805G2 emulator example- ROM Emulation- I/O emulationEmulation is discussed briefly in the User's Manual 2ed.If you have:- Documents on the 6805 and 68705 not available on Internet- Emulator/Simulator informations or software- Assist05 source not available on Internet- M68705EVM Schematic- MC146805E2 Evaluation board schematicI'm also interested inThanks,Marc

author: DiTBho
author_rank: Super Contributor
timestamp: August 25, 2024, 01:12:48 pm
content: Similar problem for M-Core.I had to buy paper-books and paper-ANs, because I was unable to find any digital copy.It seems like everything before 2000 was on paper and Motorola didn't always pay someone, likely part-time students, to scan documents

author: marcopolo
author_rank: Regular Contributor
timestamp: August 25, 2024, 03:24:48 pm
content: I've also had the same problem with some ECL application notesFor old logic circuits (RTL, DTL, ECL), MC68xx and 68K, I archive everything by topic here:https://marc.retronik.frNext month, I'm starting up my scanner again (CANON A3 with 500-sheet feeders).if any of you want to send me (in France) documents to scan on the above subjects, you're welcome to do so.It's a one-way trip, I'll cut the documents for the ADF.

author: SCSKITS
author_rank: Regular Contributor
timestamp: September 09, 2024, 03:54:45 pm
content: I have a PDF of AN-853 and the Errata.Contact me off list and I will send the PDF.edscskits at charter dot net

author: marcopolo
author_rank: Regular Contributor
timestamp: September 09, 2024, 04:09:01 pm
content: Email sent!Thanks.

author: marcopolo
author_rank: Regular Contributor
timestamp: September 20, 2024, 08:01:20 pm
content: AN853 From SCSKITS is available here:http://marc.retronik.fr/motorola/?dir=6805%2068705/Application%20Notes

author: MathWizard
author_rank: Super Contributor
timestamp: September 27, 2024, 04:04:07 pm
content: So that's for using other MCU's, is emulate other ones ?? I figured it was going to be computer software emulation, but yeah a PCB and a few parts can do it...I just downloaded a few CPU/MCU emulators, like one for the Z80. I need to read a pile just to get anywhere in the program tho. I want to find a simple 4 or 8-bit MCU emulator, with just some buttons and lights, and opcodes.

author: Benta
author_rank: Super Contributor
timestamp: September 27, 2024, 08:02:58 pm
content: Quote from: MathWizard on September 27, 2024, 04:04:07 pmI think you're confusing emulators with simulators.A simulator is a piece of software that illustrates the behavious of the CPU/MCU.An emulator is a piece of hardware with a target cable that plugs into the socket where the CPU/MCU normally sits in your system. It's able to emulate the the hardware behaviour of the chip in real time, and control all memory, peripherals etc. in the target system.

author: westfw
author_rank: Super Contributor
timestamp: September 30, 2024, 08:31:25 pm
content: Ah, "temporal context"!in the timeframe of the 6805, an "emulator" was typically a RAM-based, PC-controllable/loadable device that would plug into the target socket, but be "more easily" programmed (especially with targets that were ROM-only. But this was before flash/eeprom, and even UVEPROM-based chips were rare, expensive, and slow.) They also might provide better monitoring of useful debugging signals (like decoding the address bus to implement some sort of hardware breakpoint or code tracing.)Sometimes the manufacturer would have, or provide, other versions of the chip with external buses (as appears to be the case here) and/or extra pins, or even full-fledged (and expensive) box-level products with proprietary internals and fancy debuggers. But as high-speed, high-density RAM became more available, you could find self-built "ROM Emulator" projects in the hobbyist community as well. (For example:https://hackaday.io/project/175610-rom-emulator)