[sebhc] H-89 bus pin out Help --- Thanks for the HELP

[bill malcolm]

Thanks -- Again.
bill ..

----- Original Message ----- 
From: "Lee Hart" <leeahart at earthlink.net>
To: <sebhc at sebhc.org>
Sent: Tuesday, March 14, 2006 9:35 PM
Subject: Re: [sebhc] H-89 bus pin out Help


> bill malcolm wrote:
> > Thanks for the info: Do you have exact pin out for the 25 pins?
> 
> Sure. Here they are. D0-D7 are the data bus, and A0-A15 are the address
> bus. The control lines are active high, unless I put a slash before them
> (i.e. /WAIT means wait when low).
> 
> H89 Memory expansion connectors (left side of board)
> ---------------------------------------------------
>    P501, P502, P503 1 = gnd
> 2 = D0
> 3 = D1
> 4 = D2
> 5 = D3
> 6 = D4
> 7 = D5
> 8 = D6
> 9 = D7
> 10 = gnd
> 
>    P507, P508, P509 1 = +5v
> 2 = gnd
> 3 = A0
> 4 = A1
> 5 = A2
> 6 = A3
> 7 = A4
> 8 = A5
> 9 = A6
> 10 = A7
> 11 = A8
> 12 = A9
> 13 = A10
> 14 = A11
> 15 = A12
> 16 = MEM 0 (gen.pur.port, bit 4)
> 17 = MEM 1 (gen.pur.port, bit 2)
> 18 = /RD5 (decoded Read address strobe)
> 19 = /RD6 (decoded Read address strobe)
> 20 = /RD7 (decoded Read address strobe)
> 21 = +12v
> 22 = -12v
> 23 = +5v
> 24 = +12v
> 25 = gnd
> 
> H89 I/O expansion connectors (right side of board)
> -------------------------------------------------
>    P504, P505, P506 1 = gnd
> 2 = D0
> 3 = D1
> 4 = D2
> 5 = D3
> 6 = D4
> 7 = D5
> 8 = D6
> 9 = D7
> 10 = gnd
> 
>    P510, P511 1 = +5v
> 2 = gnd
> 3 = A0
> 4 = A1
> 5 = A2
> 6 = /BRD (buffered Read)
> 7 = /BWR (buffered Write)
> 8 = /WAIT
> 9 = /IO SER.0 (serial I/O select, port#0)
> 10 = /IO SER.1 (serial I/O select, port#1)
> 11 = /IO LP (serial I/O select, line printer)
> 12 = /IO CASS (serial I/O select, cass.tape)
> 13 = 2.048 MHz clock
> 14 = 1.8432 MHz clock
> 15 = /RESET
> 16 = I/O.0 (gen.pur.port, bit 6)
> 17 = I/O.1 (gen.pur.port, bit 7)
> 18 = /INT3 (interrupt priority #3)
> 19 = /INT4 (interrupt priority #4)
> 20 = /INT5 (interrupt priority #5)
> 21 = +12v
> 22 = -12v
> 23 = +5v
> 24 = +12v
> 25 = gnd
> 
>   P512 same as P510, P511 except for:
> 11 = /IO FLPY (hard-sector controller select)
> 12 = FMWEH (Floppy Memory Write Enable High)
> -- 
> Ring the bells that still can ring
> Forget the perfect offering
> There is a crack in everything
> That's how the light gets in    --    Leonard Cohen
> --
> Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net
> --
> Delivered by the SEBHC Mailing List
> 
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