[vcf-midatlantic] Happy owner fo a Tandy MC-10

Neil Cherry ncherry at linuxha.com
Wed Jan 23 10:00:36 EST 2019

On 1/21/19 1:49 AM, Jonathan Gevaryahu via vcf-midatlantic wrote:
> On 1/19/2019 11:23 AM, Neil Cherry via vcf-midatlantic wrote:
>> On 1/19/19 9:06 AM, Duane Craps via vcf-midatlantic wrote:
>> ...
>> 6800 family, binary compatible
>> 6800 - microprocessor
>> 6802 - 128B of RAM, (microprocessor)
>> 6808 - No ROM, No RAM (microprocessor)
>> 6801 - ROM, RAM, IO (microcontroller)
>> 6803 - RAM, IO, No ROM (microcontroller)
>> 6809 - different microprocessor, mnemonic super set (not binary compatible)
>> ...
> I'll add a few entries to your 68xx cpu/mcu list:
> 6804 - different incompatible microcontroller from 6801, slow serial ALU, 64 byte RAM, 3 
> I/O ports with DDR, mask ROM only, very rare/obscure (made for only a year or two), cannot 
> execute from RAM, this is usually lumped in with the 6805 as the 6805 was far more popular.
> 6805 - microcontroller, same opcode set/compatible with 6804, but with a fast parallel 
> ALU, both mask ROM and EPROM (with self programming!) options, and can execute code from 
> RAM; spawned the extremely successful 68HC05 and 68HC08 series later on.

Forgot about the 68HC08, I'm betting that the H8HC08 and the 6808 are not compatible.

> 68HC11 - microcontroller descendant of the 6809 but not binary compatible, much more 
> powerful than the 68hc05 and 68hc08 series opcode-wise, but not as powerful as a 6809 or 
> 68000. Has internal RAM, and either ROMLESS, Mask, EPROM or Flash ROM. This spawned the 
> backwards-compatible (I think?) 68HC12 with added fuzzy logic opcodes and related 
> features. These were popular in the automotive sector, as well as on some test equipment. 
> The 68hc11 was also used on the MIT HandyBoard, a direct ancestor to the Lego RCX 
> MindStorms bricks (the latter are H8/3292 based).

I don't have any 68HC12 boards but I have the 68HC11 eval board and several
Handy boards (are they vintage yet?).

BTW, the MC-10 arrived and started right up. The description about the
marks on the computer are correct but not as bad as expected. 30+ years
of being tossed around in storage seems to be on par for what's there.

Linux Home Automation         Neil Cherry       ncherry at linuxha.com
http://www.linuxha.com/                         Main site
http://linuxha.blogspot.com/                    My HA Blog
Author of:    	Linux Smart Homes For Dummies

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