M24 - M21 - M24 SP. 8 MHz (M24, M21) 10 MHz (M24 SP) RAM access time 150 ns (M24, M21) 120 ns (M24 SP)

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1 M24 - M2 - M24 SP CHARACTERISTICS Microprocessor 8086, 6 bit Clock 8 MHz (M24, M2) 0 MHz (M24 SP) RAM access time 50 ns (M24, M2) 20 ns (M24 SP) Wait states (M24, M2) 0 (M24 SP) Maximum RAM capacity 640K bytes ROM BIOS memory - BOARDS DESCRIPTION D.R.S. CODE CHARACTERISTICS Bus Converter/Bus 2407 Bus Converter/Bus 2403 Video Adapter Video Enhanced Adapter Video Adapter.2 MB MFD Adapter D.T.C./HDU Adapter H.D.U. W.D. Adapter H.D.U. W.D. Adapter CPU Alternate Micro Box Interface Adapter BA06/2/35 BA39/70/7 BA96 BA80 BA77 IF72/IF272/IF34 IF249 GO37/GO38/GO380 GO329 GO362 GO703 GO30/GO349 GO39 GO425 GO330 ME048/M049 ME062 ME056STL LC07 LA6 LA6B IF362 MI A 4409 G 4298 Z 403 G 487 A 4038 P 4874 P 426 N 4893 H 4053 N 4494 C 4032 H 4423 E 4899 E 4863 C 4369 F A 4052 M 4743 W Z 640 KB in System Board M24 SP/640 KB M24 SP/640 KB M24/M24 SP M2 (3 Slot 8 Bits/6 Bits) EGC 243 M M24 SP (Bit 56) Bios.36 M24 SP (Bios.36 later) CPU Z800/APB248 Single In Line (CDM 5,4) Bios.43/MSDOS 3.20/3.27 Emulates 874 Nivel CSNZ (.) M24 - M2 - M24 SP -

2 PAL AND ROM BIOS LEVEL M24/M2 ROM Bios Bus Adapter Wait Logic RAM Add. I/O Logic KBC uc 874 KBC uc 804 Firmware POS. EVOLUTION 6 F 6 H 8 H 6 J 2 P 6 E 0 U PBFBH PBCFL PL48 PL95 PL49 PL5 CSNE/CSHX PDBA/PDBB.0H.0L PBFD CSNY/CSNZ PDBE (.).0H.0L PL5 PL74 CS40 PDBP (.2).2H.2L PL52B PDBP (2.).36H.36L PL90.43H (PQBK).43L (PQBL) PBFY NOTE: (ANK 2463 = IBM Y ANK 2462 = OLIVETTI) M24 SP POS. EVOLUTION ROM Bios 6 F PBFW.36H PQBK.43H 6 H PBFV.36L PQBL.43L Bus Arbiter Wait Logic RAM Add. I/O Logic 8 H 6 J 2 P 6 E PL86 PBFX PL90 PL85 PBFZ COMPATIBILITY PBFY (M24) (CDM /525) PBFZ (M24 SP) PL52 (M24) (BIT /24 PL74 (M24) (BIT /24) PL90 (M24) * (BIT /48) Solves timing problems of the 8250 serial interface controller and (bit 05) keyboard controller To install APB card Possibility of selecting between 8250 and 8530 by switch RAM Address improvement Born with.36 BIOS release BIOS.0 Does not support MS-DOS REL REV. 327 "Frame Work" and "Symphony" compatibility BIOS.36 (BIT /48) BIOS.43 * (CDM /529) (BIT /58) (*) ROM BIOS.43 + LP90 manage EGA emulation Extends H.D. table in W.D. Adapter (GO39) COM2/EGC/COPROCESSOR right management Manages: MFDU 3.5" 720 KB Token Ring L.A.N. EGA Compatibility -2 M24 - M2 - M24 SP

3 SYSTEM BOARD SETTINGS: M24, M2: BA06/BA2/BA35/BA39/BA70/BA7/BA96 M24 SP: BA80/BA77 GROUP UP PIT GROUP 0 PIC FDC B G SCC ACE DMAC NDP H CPU ROM L ROM H DIP-SWITCHES OF GROUP 0 BANK 0 BQA5A AREA RAM Capacity ON ON ON 28 KB System Board ON ON ON ON ON 28 KB PEXP ON ON ON 256 KB PEXP ON ON 384 KB PEXP ON ON ON 52 KB Bank 0 ON ON 52 KB PB Bank 0 28 KB PB Bank ON 28 KB PB Bank 0 52 KB PB Bank AREA Coprocessor ON Not installed Installed Serial ON 8250 ACE Asynchronous Interface 8530 SCC Synchronous System memory from ON RAM Bank 0 BIOS REL..36 RAM Bank 0 and M24 - M2 - M24 SP -3

4 DIP-SWITCHES OF GROUP AREA Floppy Disk Unit 720 KB (3.5") ON 360 KB (5.25") Speed ON Startup 800 ns Startup 250 ns EPROM-BIOS ON ROM HDU System board ROM HDU External Video ON Scroll CPU Slow scroll AREA Monitor type 80 x 25 monochrome ON 40 x 25 colour ON 80 x 25 colour ON ON EGA (*) MFDU ON ON MFD unit ON 2 MFD units (*) BIOS.43 only JUMPERS (ONLY M24 SP BA80/BA77) JUMPERS POS. B - B2 CLOCK 8 MHz FDC B B2 - B3 CLOCK 4 MHz FDC OUT Floppy controller enable G IN Floppy controller disable JUMPERS POS. H MHz H H MHz OUT Normal C and E IN Production test KEYBOARDS COMPATIBILITY TYPE PROTOCOL LAYOUT ANK2462 ANK2463 ANK2502 ANK2886 ANK25-02 Standard AT IBM M240 type M28 type 0/02 keys -4 M24 - M2 - M24 SP

5 COMPATIBILITY NOTES Management of M24 SP for MB MFDU settings to be made: - Disable floppy disk controller of system board - Make modifications described in COM 505 M24 - Insert new MFD adapter in the bus converter GO703 Needed for installation of following options: (See CDM520) - EGC 243 board (GO329): ROM BIOS.36 System board PAL 90 System board PAL 73 Video Controller GO Coprocessor: ROM BIOS.36 PAL 90 - Serial interface: ROM BIOS.36 PAL 90 - Mouse GRD 2469: Firmware PDBN (BIT G5) - APB 248 (CPU Z800) PAL PL52 (BIT 24) I/O ADDRESS MAP INTERRUPT LEVELS ADDRESS LEVEL F F 0F0-0FF F8-2FF F F F 3C0-3CF 3D0-3DF 3F0-3F7 3F8-3FF DMA controller Interrupt controller Timer Serial controller (8530) Parallel controller (8255) System configuration Date and time PROM address Expansion box Serial port 2 Hard disk controller Parallel port SDLC communication Reserved Video adapter Floppy disk controller Serial port (8250) IRQ0 IRQ IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 DMA CHANNELS CHANNEL DMA0 DMA DMA2 DMA3 Timer Serial port Hard disk Floppy disk Parallel port RAM refresh Floppy disk M24 - M2 - M24 SP -5