Difference between revisions of "Chaosnet interface"

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(→‎External links: Converted SUDS drawings.)
(Add registers)
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I am not certain of this; I think cards with pins on the back did this, which is why they made card with pins on the package side. -->
 
I am not certain of this; I think cards with pins on the back did this, which is why they made card with pins on the package side. -->
  
−
Their [[bus]] [[address]] <!-- and [[interrupt vector]]s --> can be set via [[Dual Inline Package|DIP]] switches; <!-- to 7mnnp0 for the address (where m can be 6 or 7, and p 0,2,4 or 6), and 0xx0 for the vector. --> the default is 0764140<!-- and 0340 - looks like there are enough DIPs for the vector too, but no docs -->. The [[network address]] is also set via a DIP switch.
+
Their [[bus]] [[address]] and [[interrupt vector]]s can be set via [[Dual Inline Package|DIP]] switches; <!-- to 7mnnp0 for the address (where m can be 6 or 7, and p 0,2,4 or 6), and 0xx0 for the vector. --> the default is 0764140<!-- and 0340 -->. The [[network address]] is also set via a DIP switch.
  
 
==Device registers==
 
==Device registers==
Line 40: Line 40:
  
 
In the register contents (below), bits which are read/write or unused are shown in normal font, those which are read-only are in ''italics'', and those which are write-only are shown in '''bold'''.  
 
In the register contents (below), bits which are read/write or unused are shown in normal font, those which are read-only are in ''italics'', and those which are write-only are shown in '''bold'''.  
−
<!-- ===764000: Control Status Register (CSR)===
+
 
 +
===764140: Control Status Register (CSR)===
 
{{16bit-header}}
 
{{16bit-header}}
−
| colspan=2 | '''XM''' || colspan=6 | '''FUNC''' || ''CDN'' || CIE || ''RDN'' || RIE || colspan=4 | ''STAT''
+
| RDN || ''ERR'' || '''RST''' || colspan=4 | ''LSTCN'' || '''TCL''' || TDN || ''TAB'' || TEN || REN || '''RCL''' || SPY || LPBK || TIE
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
Line 50: Line 51:
 
! Bits !! Use
 
! Bits !! Use
 
|-
 
|-
−
| XM || Extended address bits A17 and A16
+
| RDN || Receive done
 
|-
 
|-
−
| FUNC || Command Function Code
+
| ERR || [[Cyclic redundancy check|CRC]] error
 
|-
 
|-
−
| CDN || Command Done
+
| RST || I/O reset for interface
 
|-
 
|-
−
| CIE || Command Done Interrupt Enable
+
| LSTCN || Count of messages lost
 
|-
 
|-
−
| RDN || Receive DMA Done
+
| TCL || Receiver clear
 
|-
 
|-
−
| RIE || Receive DMA Done Interrupt Enable
+
| TDN || Transmitter done
 
|-
 
|-
−
| STAT || Command Status Code
+
| TAB || Transmit aborted by conflict
 +
|-
 +
| TEN || Transmit interrupt enable
 +
|-
 +
| REN || Receive interrupt enable
 +
|-
 +
| RCL || Receiver clear
 +
|-
 +
| SPY || Spy - accept any messages
 +
|-
 +
| LPBK || Loop back in interface
 +
|-
 +
| TIE || Timer interrupt enable<br>(was Transmitter busy)
 
|}
 
|}
  
−
#define CH_TBSY 01              /* Transmitter busy */
+
===764142: My Address Register (MYN)===
 +
{{16bit-header}}
 +
| colspan=8 | ''Subnet7 <---> Subnet0'' || colspan=8 | ''Host7 <---> Host0''
 +
{{16bitoctal-bitout}}
  
−
#define CH_LPBK 02              /* Loop back in interface */
+
Read-only register.
−
#define CH_SPY  04              /* Spy - accept any messages */
 
  
−
#define CH_REN  010            /* Receive enable */
+
===764142: Write Buffer Register (WBF)===
 +
{{16bit-header}}
 +
| colspan=16 | '''OutData15 <--- OutData00'''
 +
{{16bitoctal-bitout}}
  
−
#define CH_RIEN 020            /* Receive interrupt enable */
+
Write-only register.
−
#define CH_TIEN 040            /* Transmit interrupt enable */
 
  
−
#define CH_ABRT 0100            /* Transmit aborted by conflict */
+
===764144: Read Buffer Register (RBF)===
  
−
#define CH_TDN  0200            /* Transmission done */
 
−
 
−
#define CH_TCLR 0400            /* Transmitter clear */
 
−
 
−
#define CH_LC1  01000          /* Count of messages lost */
 
−
#define CH_LC2  02000
 
−
#define CH_LC3  04000
 
−
#define CH_LC4  010000
 
−
#define CH_LC  (CH_LC1 | CH_LC2 | CH_LC3 | CH_LC4)
 
−
 
−
#define CH_RST  020000          /* I/O reset for interface */
 
−
#define CH_CRC  040000          /* CRC error */
 
−
#define CH_RDN  0100000        /* Input done */
 
−
 
−
===764002: Bus Address Register (BAR)===
 
 
{{16bit-header}}
 
{{16bit-header}}
−
| colspan=16 | '''BA15 <--- BA00'''
+
| colspan=16 | ''InData15 <--- InData0''
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
−
Write-only register.
+
Read-only register.
  
−
===764004: Byte Count Register (BCR)===
+
===764146: Read Bit Counter Register (RBC)===
  
 
{{16bit-header}}
 
{{16bit-header}}
−
| colspan=16 | '''BC15 <--- BC0'''
+
| colspan=4 | Unused || colspan=12 | ''BitCount11 <--- BitCount0''
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
−
Write-only register. -->
+
Read-only register.
 +
 
 
==External links ==
 
==External links ==
  

Revision as of 00:58, 16 September 2023

CH11 Unibus board

The Chaosnet UNIBUS interface (also called the CHAOS-11, CH11, QUAD and QAD; there was no generally-used name) and QBCHNI are Chaosnet network interfaces, for the UNIBUS and QBUS respectively. (The two device controllers are identical in programming terms, so they are both covered in this single article.)

They use programmed I/O to transfer data to and from buffers in main memory. They have on-board buffers (one each for inbound and outbound) which can hold one packet of data.

They are both a single quad wire-wrapped card.

Their bus address and interrupt vectors can be set via DIP switches; the default is 0764140. The network address is also set via a DIP switch.

Device registers

They have 7 registers:

Register Abbreviation Address
Command and Status Register CAICSR 764140
My address (read only) CAIMYN 764142
Write buffer (write only) CAIWBF 764142
Read buffer CAIRBF 764144
Read bit counter CAIRBC 764146
Unused   764150
Initiate transmission CAIXMT 764152
Unused   764154
Unused   764156
Load interval timer (write only) CAITIM 764160


In the register contents (below), bits which are read/write or unused are shown in normal font, those which are read-only are in italics, and those which are write-only are shown in bold.

764140: Control Status Register (CSR)

RDN ERR RST LSTCN TCL TDN TAB TEN REN RCL SPY LPBK TIE
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Bits are:

Bits Use
RDN Receive done
ERR CRC error
RST I/O reset for interface
LSTCN Count of messages lost
TCL Receiver clear
TDN Transmitter done
TAB Transmit aborted by conflict
TEN Transmit interrupt enable
REN Receive interrupt enable
RCL Receiver clear
SPY Spy - accept any messages
LPBK Loop back in interface
TIE Timer interrupt enable
(was Transmitter busy)

764142: My Address Register (MYN)

Subnet7 <---> Subnet0 Host7 <---> Host0
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Read-only register.

764142: Write Buffer Register (WBF)

OutData15 <--- OutData00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Write-only register.

764144: Read Buffer Register (RBF)

InData15 <--- InData0
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Read-only register.

764146: Read Bit Counter Register (RBC)

Unused BitCount11 <--- BitCount0
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Read-only register.

External links

Retrieved from "https://gunkies.org/w/index.php?title=Chaosnet_interface&oldid=31625"