🚀 go-pugleaf

MS>I've noticed on the specs of the Trantor parallel port-to-SCSI adaptor that
MS>writes (i.e. output from the parallel port) are twice as fast as reads
MS>("input" via the parallel port). Does this mean the "input" is kludged?

It means they use 8bits for the output and 4bits for input the PC
parallel port has a LIMITED number of inputs but considerably
more outputs.  Here is what I'm talking about:
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Programing the IBM PC Parallel Port
Ports for LPT1
~ indicates active low output
0x378 DATA          0x37A Input         0x37A Output
BIT                 BIT                 BIT
[7] D7              [7] Busy            [7] unused
[6] D6              [6] ~Acknowledge    [6] unused
[5] D5              [5] Paper Out       [5] unused
[4] D4              [4] Select          [4] IRQ 7 En
[3] D3              [3] ~Error          [3] select
[2] D2              [2] unused          [2] ~PRIME
[1] D1              [1] unused          [1] ~AutoFeed
[0] D0              [0] unused          [0] ~Strobe
pinouts for DB25 parallel Port
[O](01) ~Strobe                        [O](14) Auto Feed
[O](02) D0                             [I](15) ~Error
[O](03) D1                             [O](16) ~Prime
[O](04) D2                             [O](17) Select to printer
[O](05) D3                             [G](18) Ground
[O](06) D4                             [G](19) Ground
[O](07) D5                             [G](20) Ground
[O](08) D6                             [G](21) Ground
[O](09) D7                             [G](22) Ground
[I](10) ~acknowledge                   [G](23) Ground
[I](11) Busy                           [G](24) Ground
[I](12) Paper out                      [G](25) Ground
[I](13) Select from printer
--------------------------------------------------------------------------------
notice their are 13 ouput bits and only 5 input
1 input bit is used for IRQ7 the other 4 remaining bits are for
data input.
8 bits are available for output and another bit [other than
strobe] is used to flag a transfer.

        STEPHEN CYBERMAN@TOZ.BUFFALO.NY.US
        commiserated at Sat  04-11-1992  11:47:24
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 * SLMR 2.1a * When you spit in the wind it comes right back at you.