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Tom Durston Optional > Tom Durston 88-2SIOJP > Tom Durston Supplemental > Tom Durston Drive Cabinet > Mainframe Configurations > What is included >  
Tom Durston's Mainframe Configurations

All the boards have been tested and were working just before packing


Basic Board Set Configuration

The Basic Configurion includes 48K of Static RAM, two serial ports, disk controller pair, and custom front panel interface. Additional configurations are included that add more memory, PROM monitors and Boot PROMS.

Left to Right, facing front panel:

  1. Empty slot
  2. Empty slot
  3. Empty slot
  4. Empty slot
  5. 88-2SIO with CTS on port 2

  6. No Connector, No Card Guides
  7. Custom Front Panel Interface
  8. No Connector, No Card Guides
  9. 8800B CPU BD
10. Empty Slot
11.
Disk Controller 1/2
12. Disk Controller 2/2

13. Empty Slot
14. 88-16MCS, 16K Static Memory
15. 88-16MCS, 16K Static Memory
16. 88-16MCS, 16K Static Memory
17.
Empty Slot
18. Empty Slot




64K Board Set Configuration
(Supports Altair Accounting)

The 64K Configuration adds two boards to the Basic Configuration.

  • Altair Turnkey Module with CLG Mod

Turnkey Page


Turnkey Notes


  • 88-16MCS, 16K Static Memory

The Turnkey Module includes a third serial port, UBMON Monitor PROM, and DBL Boot PROM.


The 64K configuration with dual drive makes this system functionally equivalent to a MITS 300/25 Business System.


The 64K configuration is the preferred configuration because it can run the Altair Accounting Software, uses less boards, and produces less heat.

64K Configuration Mainframe - 130W
60K Configuration Mainframe - 140W

Turnkey Notes

Turnkey Page


60K Board Set Configuration with AltMon Monitor




The 60K Configuration adds four boards to the Basic Configuration and includes:

  • 88-PMC Prom Memory Card

  • 88-4MCS 4K Static Memory
  • 88-4MCS 4K Static Memory
  • 88-4MCS 4K Static Memory

The 88-PMC includes:




The 60K Configuration has powerful the ALTMON Monitor PROMs and allows various configurations of the top 4K of memory. The 60K Configuration uses more boards, and produces more heat.

64K Configuration - Mainframe 130W
60K Configuration Mainframe Mainframe Mainframe - Mainframe 140W

AltMon Command Summary:

     B boot disk
by jumping to Altair disk boot loader (FF00)
     C SSSS FFFF CCCC
compare blocks of memory
     D SSSS FFFF
dump memory in hex and ASCII
     E SSSS FFFF DDDD
exchange blocks of memory
     F SSSS FFFF DD DD
find two byte sequence in memory
     G SSSS
go to and execute
     H P
load Intel hex file from 2SIO port 0 or 1
     I PP
input from I/O port
     J SSSS
go to and execute (G)
     K SSSS FFFF DD
fill block of memory with “K”onstant
     L P
load Intel hex file from 2SIO port 0 or 1
     M SSSS FFFF DDDD
move block of memory
     N
non destructive memory test (size RAM)
     O PP DD
output to port
     P LLLL
program memory (modify memory)
     Q SSSS FFFF
compute checksum on range of memory
     R
non destructive memory test (size RAM)
     S SSSS FFFF DD
search for single byte in memory
     T SSSS FFFF
test memory


e 60K Configuration uses more boards, and produces more heat.

The 60K Configuration uses more boards, and produces more heat.

Remote CP/M Configuration (Internet/LAN Ready)

60K or 64K RAM Configuration

CTS supported on second RS-232-port

GW312 RS-232 to Ethernet Server (2 port)

The GW312 connects the Console and Communication RS-232 Serial Ports to an Ethernet network. The serial ports can be accessed by Telnet or a terminal program on a PC.

CAT6 flat Ethernet cable

File transfer software
BYE - Remote CP/M
XModem - Remote File Transfer
MDM 7.12 - Local File Transfer Terminal Program
PCGET - Get file from a PC
PCPUT - Put file to a PC
FLOP2PC - Send Altair disk image to a PC
PCTOFLOP - Make Altair floppy from a PC disk image file
New Sweep CP/M file tool


Remote Console software

BYE RCP/M

Simple BBS software
MINI-RBBS