Clone ROM cards

6 posts / 0 new
Last post
Offline
Last seen: 1 year 1 week ago
Joined: Aug 4 2018 - 21:59
Posts: 139
Clone ROM cards
AttachmentSize
Image icon 20180812_102701.jpg359.19 KB

I had a few clone motherboards that were missing their ROM cards so I had some made.

The cards are for the type of common clone that has 64K and a z80 on the mainboard. The minimum order to get boards made was 10 so I have a few more than I needed.

Bare boards US$4 plus $3.50 postage, if anyone needs one, PM me.for my Paypal details.

Offline
Last seen: 2 hours 55 min ago
Joined: Jul 5 2018 - 09:44
Posts: 2538
These would be great for

These would be great for people who've either lost the originals cards or would like a 2nd card to use with different ROM images. The ROM card a lot of people with a ][+ (or an original ][ I suppose) would probably like would be a work-alike of the Apple INTBASIC/Applesoft ROM card, except pre-set up for EPROMs (the originals require an adapter socket) and with the switch already on a piggy tail so it can be used in any slot. It could probably be made with fewer chips in a modern version too using higher density EPROMs and maybe a GAL instead of the 74LS chips used on the originals.

Offline
Last seen: 1 year 1 week ago
Joined: Aug 4 2018 - 21:59
Posts: 139
I use one of the cards fitted

I use one of the cards fitted with a dead boot ROM I wrote. it will boot in a machine with faulty RAM and give an indication a RAM failure both by writing to the screen and beeps via the speaker for when RAM is so bad nothing is readable. Sadly I lost the source code for the ROM but one day I will recreate it.

I do have plans to create a ROM card that will work in any Apple2 slot. It will be designed to have Applesoft, Integer and also a selection of F8 ROM options selectable via dip switches. The design is done in my head, i just need to get motivated and lay out a board in KiCAD.

I also need to decide on the type of switch to enable the card, the type Apple used on their ROM card is hard to come by these days.

Offline
Last seen: 2 hours 55 min ago
Joined: Jul 5 2018 - 09:44
Posts: 2538
That sounds like a very nice

That sounds like a very nice card to have.

amauget's picture
Offline
Last seen: 1 day 10 min ago
Joined: Jan 3 2011 - 11:34
Posts: 339
Diag ROMs

Hi,
Maybe you can take a look here.
I've collected many ROMs from various sources. These ones are designed for the //e.

Offline
Last seen: 1 year 1 week ago
Joined: Aug 4 2018 - 21:59
Posts: 139
amauget wrote:Hi,

Hi,
Maybe you can take a look here.
I've collected many ROMs from various sources. These ones are designed for the //e.

Yes, The ROM you call "blind" is the one I wrote.
In fact it all looks like it was taken from my posts in the VCF forums.
I've since discovered that the z80 clone ROM will only boot sometimes with a faulty RAM, my initial tests that led me to believe it was better than it was were a fluke.

Log in or register to post comments