IMSAI EPROMS

Hi all... I've been trying to get some action from this IMSAI for awhile now. Main problem is I don't know what is on the EPROMs on the EconoROM board. It looks like banks A & B, OR banks C & D, can be enabled together starting at address 0000h. There are 6 2708's in A0 through B1, and 8 2708's in C0 through C3. I've been looking for an EPROM burner that can read/write 2708's with no luck so far. We have TWO machines at work, and neither will do it. Anyone know of a burner that WILL? I manually read the first 256 bytes of the first chip, and disassembled it, also manually - I'm looking for a good disassembler program too! I've got one called DASM V1.2 by John Wilson, but have been having some trouble with it. If you've got a few minutes, have a look at what I've included below - the first 128 bytes of code. Let me know if any of it looks familiar. (Or if I messed up the job!) The comments are for my own benefit - I'm pretty rusty with assembler. Addr. Hex Value Mnemonic Comments 0000 AF XRA A ;Exclusive Or A with A (clears A) 0001 C3 3B 00 JMP 003B ;Jump to 003Bh 0008 C3 EE EF JMP FFEE ;Jump to FFEEh 0010 C3 F1 FF JMP FFF1 ;Jump to FFF1h 0018 C3 F4 FF JMP FFF4 ;Jump to FFF4h 0020 C3 F7 FF JMP FFF7 ;Jump to FFF7h 0028 C3 FA FF JMP FFFA ;Jump to FFFAh 0030 C3 FD FF JMP FFFD ;Jump to FFFDh 0038 C3 D3 09 JMP 09D3 ;Jump to 09D3h 003B D3 F0 OUT F0 ;Send contents of A register to port F0h 003D C3 11 D2 JMP D211 ;Jump to D211h 0040 3B DCX SP ;Decrement stack pointer 0041 00 NOP ;Do nothing 0042 C3 5C 00 JMP 005C ;Jump to 005Ch 0045 21 00 F0 LXI H,00 F0 ;Load register pair H & L with F000h 0048 0E 4E MVI C,4E ;Move 4E to register C 004A AF XRA A ;Clear register A 004B 77 MOV M,A ;Move register A to loc'n given in H & L 004C 23 INX H ;Increment H & L registers 004D 0D DCR D ;Decrement register C 004E C2 4B 00 JNZ 004B ;Jump on no zero to address 004Bh 0051 06 18 MVI B,18 ;Move 18h into register B 0053 21 2A F1 LXI H,F12A ;Load H & L registers with F12Ah 0056 77 MOV M,A ;Move register A to loc'n given in H & L 0057 23 INX H ;Increment H & L registers 0058 05 DCR B ;Decrement register B 0059 C2 53 00 JNZ 0053 ;Jump on no zero to address 0053h 005C 31 9E F0 LXI SP,F09E ;Load stack pointer with F09Eh 005F CD 42 01 CALL 0142 ;Transfer program control to addr 0142h 0062 06 2A MVI B,2A ;Move 2Ah into register B 0064 CD 51 01 CALL 0151 ;Transfer program control to addr 0151h 0067 CD 7A 00 CALL 007A :Transfer program control to addr 007Ah 006A 23 INX H ;Increment H & L registers 006B 7E MOV A,M ;Move value from loc'n in H & L to reg A 006C FE 3A CPI 3A ;Compare A with 3Ah (A - 3Ah) 006E DA 7A 05 JC 057A ;Jump on carry to 057Ah 0071 CD DE 01 CALL 01DE ;Transfer program control to addr 01DEh 0074 CD 94 01 CALL 0194 ;Transfer program control to addr 0194h 0077 C3 5C 00 JMP 005C ;Jump to address 005Ch 007A 21 BC F0 LXI H,F0BC ;Load H & L registers with F0BCh 007D 22 50 F0 SHLD F050 ;Store H & L registers at F050h Joel A. Weder jweder(a)telusplanet.net 403-556-4020