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Old 05 February 2013, 10:42   #495
Join Date: Jun 2010
Location: out in the wild
Posts: 1,136
ACA500 prototype 2 pictures and preliminary data


Prototype 2 of the ACA500 has passed three important tests:

1. MBRtest for all memory types
2. run a full AIBB module
3. girlfriend-installation-test (tm) passed without the need for a helping hand!

I might be able to gain a little speed on fastmem, but that will not change anything significant on performance. It's more like a "because I can" thing - if a refresh crosses an access, then the access loses up to three cycles, and that hurts feelings more than performance.

technical data up to this point:
- 68EC000 @ 14,3MHz (double speed of the A500)
- purely external connection, A500 doesn't have to be opened
- Computer will only be wider by just over an inch
- two CF-card slots: One for booting, and the other for exchanging data with a PC
- 2MByte physical RAM, where 1,5M are usable as fastmem and 512k are for Maprom
- trapdoor memory expansions (no matter what size) can still be used
- Chipmem-expansions can still be used
- ROM for things that I can't publish at this point
- local expansion port, will be documented openly (14MHz 16-Bit = twice Zorro-speed)
- clockport for A1200 hardware (Silversurfer, Catweasel MK2...)
- optional expansion with ACA1231/ACA1232

I'm still planning a steel cover for the thing, and there will be special versions for A2000 and A1000. Please note that the A2000 version will be incompatible with anything that does DMA - it won't work with GVP SCSI or A2090/A2091.

Attached Thumbnails
Click image for larger version

Name:	ACA500_proto2_on_lifesupport.JPG
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ID:	34178   Click image for larger version

Name:	ACA500_Sysinfo_Feb_4_2013.JPG
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ID:	34179   Click image for larger version

Name:	ACA500_AIBB_Feb_4_2013.JPG
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ID:	34180   Click image for larger version

Name:	ACA500_proto2_with_ACA1232.JPG
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Size:	55.3 KB
ID:	34181  
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