[pdp7-unix] ald

Tom Everett tom at khubla.com
Mon Oct 21 12:10:31 AEST 2019


ok so the ald command does go on the image then: its a legit command

Bob Supnik via pdp7-unix wrote on 2019-10-20 7:45 PM:
> It's probably a CR01B; I doubt if Bell could afford a Type 421.
>
> The CR01B was a complete POS. It sensed the punched holes with little 
> mechanical fingers with starred wheels on the end that either went 
> through and made contact (1) or did not (0). It required constant 
> attention from Field Service.
>
> Do we need a CR simulator? I fervently hope not.
>
> /Bob
>
> On 10/20/2019 8:23 PM, Phil Budne via pdp7-unix wrote:
>> Tom wrote:
>>> Does anyone know what "ald" does?
>> Looks to me like it's reading binary punched cards.
>>
>> It gets some card read-related system addresses,
>> and defines an I/O instruction:
>>
>> crsb = 0706744
>>
>> which is defined on page 96 of
>> http://www.bitsavers.org/pdf/dec/pdp7/F-75_PDP-7userHbk_Jun65.pdf
>>
>> to select card reader "column binary" mode, reading the rows of each
>> column in as a 12 bit number.
>>
>> p
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-- 
Tom Everett
tom at khubla.com <mailto:tom at khubla.com>
<https://www.postbox-inc.com>
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