[Info-vax] Graphics cards and monitors, was: Re: VSI Software and Stark Gaming

[Johnny Billquist]

On 2015-08-12 15:51, Jerry Eckert wrote:
> On 8/11/2015 6:59 PM, Johnny Billquist wrote:
>
>>
>> I agree about the mistake, even if your math is off.
>> At 14Gpixel, and 1B/pixel, you'll need 1.75Gbyte of memory. A VAX-11/780
>> could take (I think) theoretically 512 MByte of memory, so you would
>> have had to have 4 machines for it.
>> Your math would be right if the machine held just 1Mbyte of memory, but
>> I would not have called that a fully loaded VAX-11/780, not even in 1977.
>>
>>      Johnny
>>
>
> The maximum memory in the 11/780 was 4MB in the main cabinet, with an
> additional 4MB if an expansion cabinet was added.

Not sure how relevant that is. Or correct.

> The memory modules were 256KB each, so 512MB would have required 2048
> full-sized modules. The price was around $5-6K/MB, IIRC.

The question is, how many address lines did you have in the boxes? 
Memory on the 11/780 sat directly on the SBI. So it becomes a question 
of how many address lines the SBI have.
Even the VAX-11/750 eventually managed to get 4MB memory modules.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
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