The Sinclair QL Forum

although the ipc dissassembly I have has addresses against the dissassembly - so is also quite useful.

Hi,

I read in the binary image of a Phillips MAB8049H using the Hilo Systems ALL03A programmer using the 8749H settings.

The binary saved to a file called: MAB8049H.ROM
I noted that the 8049 and 8749 file are 2048 bytes in size, as is the Hermes code file.

This means my programmer is only saving the eprom part of the chip, not the complete chip.

The Hermes IPC extension IPCVER$ returns 0.0 in each case, according to the Hermes manual indicates a non-Hermes IPC.

I see little point in disassembling each file, since Laurence Reeves has already done this to produce the Hermes code.

The Hermes code fixed many problems with the 8049 and I would replace all 8049 chips with updated Hermes chips.

Derek_Stewart wrote:I have been repairing a QL board, which is now working. It has a NEC D8749HC installed see picture below:
NEC D849HC.jpg
Which the Hemes function IPCVER$ returns 0.0

According to the Hermes manual, this means it is non-Hermes.

I am assuming the NEC D8749HC emulates the 8049 and is not updatable.

The code equals the original QL IPC but with different keyboard scanning code. Weren't there some external keyboard solutions that came with their own IPC?

P.S.: Ah, just now saw that Prof already came to the same conclusion, sorry

Derek_Stewart wrote:The binary saved to a file called: MAB8049H.ROM

This is the original QL IPC code.

Here is a very interesting vendor from Poland that has several available batches of 8749 IPC chips. Ignore the first 4 which are one time programmable used, hence already programmed and not erasable.

https://www.ebay.de/str/tvsatelectronic ... &_bkw=8749

These guys have many interesting chips for anyone who wants to experiment with (vintage) hardware, and usually quite reasonable prices.

Nasta wrote:Here is a very interesting vendor from Poland that has several available batches of 8749 IPC chips. Ignore the first 4 which are one time programmable used, hence already programmed and not erasable.

https://www.ebay.de/str/tvsatelectronic ... &_bkw=8749

These guys have many interesting chips for anyone who wants to experiment with (vintage) hardware, and usually quite reasonable prices.

I've used these guys a good few times - many interesting components - and they ship relatively quickly too!

Nasta wrote:Here is a very interesting vendor from Poland...

Good find, here's UK link: https://www.ebay.co.uk/sch/i.html?_dmd= ... &_nkw=8749