[rescue] [OT] S: IBM /370 or /390 card

[Mike Katz]

On 9/12/2023 3:06 PM, Joshua Boyd via rescue wrote:
>
> On 9/12/23 15:25, Patrik Schindler via rescue wrote:
>> Hello,
>>
>> IBM at one point made cards with a "mainframe type" CPU and some RAM 
>> on a card to fit in a PC. I'm interested in obtaining one for a 
>> reasonable price.
>>
>> I'm located in Germany but have a friend travelling from/to the US 
>> regularly to aid with transport of "small things".
>>
>> :wq! PoC
>
>
> Wasn't the XT/370 primarily made with 68000s with custom microcode?  
> I'd love to see someone work out how to redo that on a newly made board.
>
That is exactly correct.  IBM took a pair of Motorola 68000's and 
re-microcoded them to execute the 370 instruction set.  As a Motorola 
68000 fan I think it is poetic justice that IBM used a 68000 when they 
wanted more processing power than an 8086 or 80286 could provide 🤣.

Supposedly one of the reasons that the original PC used an Intel 4.77mHz 
8-bit bus 8088 was that the 8MHz 16-bit bus 68000 was more powerful than 
an entry level 360.  I don't know about a 68008 (8-bit bus version of 
the 68000).
>
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