Latest version freely down-loadable now. See also the technical history of the firmware of the Micro mk 2 or the Micro-3.
| Date | Version | Summary |
| 04/06 | 18 | Fixes an odd problem in USB communications that occurs with fast host PCs. |
| 04/03 | 17 | Prevents USB character data overflow. |
| 07/01 | 16 | getSysData extended to return max channels in non burst mode, burst mode result fixed, setAdcList now allows the maximum channel possible. |
| 02/01 | 15 | Fixed minor error in USB read data sequencing. |
| 02/00 | 14 | Fixed a couple of USB problems; diagnostic ramp address would hang 1401, self-test errors with cable out did not give usual flashing LED behaviour. |
| 11/99 | 13 | Added code to support the USB and provide diagnostics, plus minor fixes. Error1401 added to symbol table. |
| 11/98 | 12 | Offset parameter for TOHOST/TO1401 changed to 32 bit. |
| 08/98 | 11 | ADC command does setAdcSilo(1,1) to reset the silo. |
| 07/98 | 10 | Inverted sense of events read from switch pack to match documentation. New FPGA version 4, adds ADC convert on clock start. Added support for extension EEProm in top boxes (but resistor is missing from data line!). Now allows up to 32 values returned from command (was 10). |
| 09/97 | 9 | Fixed command loading bug. If command had little un-initialised data, could corrupt relocation table. Now CLOAD returns 253,0 - corrupt command header, 253,1 - unknown symbol referenced, 253,2 relocation overflow. |
| 05/97 | 8 | Set host ports back to 100 ns as it caused errors when top boxes added. |
| 04/97 | 7 | Changed DAC1 use in self test to use raw o/p so that the patch card would not foul up self-test. Also set the host port speeds to M0 (50 ns), were 100ns. |
| ??/97 | 6 | Internal testing version for host port/PCI speed up. |
| 12/96 | 5 | Fixed faults in blkSetA\blkSet that caused incorrect use of the advanced DMA modes. |
| 10/96 | 4 | Added support for Spike2 top box LEDs. |
| 06/96 | 3 | DAC command was using SHORTREF() to update DACs. This meant that only upper 8-bits were set as compiler did two 8-bit writes, and ls byte was lost. |
| 04/96 | 2 | No code changes (u1401mon.c had REVISION changed to 2). XILINX code modified to: 1)Link DILCSR flag to E1 int, 2) Fix state of unused pins on XILINX parts. |
| 01/96 | 1 | Changed the bitmap length for FPGA to 0x168f1. Changed EEPRdCode to set Z flag if all ok. This made Auto-setting of ADC gain/offset work. RESET revision changed. Labelled as ROM 0.01. |